Talk:Comparison of memory cards

message: I guess I will try to add that column in the next day or two. --WhiteDragon 05:08, 17 August 2006 (UTC)
replies: text: ok, I'm blind.  In my defense, it's late and I haven't had enough sleep :-P --WhiteDragon 05:09, 17 August 2006 (UTC)
thread_title: Where's SD?

message: I was just looking at this page and I notice a few things that seem out of date.  I'd try editing myself but I don't really feel all that qualified on this subject.
# The maximum for CompactFlash is listed as 12000MB but Sandisk currently has a 16GB card out.  Is that because it's hasn't actually shipped yet?  I notice that bhphotovideo.com says it is estimated to be available in November, which has passed.
# The flash technology for CF is listed as NOR but I'm pretty sure that modern CF cards are NAND.  If I am correct, maybe it should read NOR or NAND?: Please provide a verifiable reference to these 2 facts, for example, press-releases of major manufacturing companies. There are lots of hoaxes on high-capacity memory cards, such as counterfeits of SONY USB flashes that claim to be 8GB, but are 64MB in reality. For the NOR/NAND - if it's true and verifiable - let's add it as "NOR or NAND"? --GreyCat 10:20, 7 December 2006 (UTC)
replies: text: I believe that that section should be reworked completely. There's myriads of adapters possible and available. It would be very 
# I have been unable to determine from the Sandisk web site if the big Sandisk CF cards (8/12/16GB) are CF-I or CF-II. —The preceding unsigned comment was added by Billdav (talk • contribs) 20:39, 6 December 2006 (UTC)

text: Who is to say one way or another?  CompactFlash is an interface and doesn't mandate that memory cells be made of any specific material.  If they could make flash memory out of tree bark, I'm sure it could be made to interface with CompactFlash.  The 4 gigabyte MicroDrive I own is CompactFlash, and it surely is neither.  The argument as to whether it's NAND or NOR or anything else is moot. Reswobslc 07:19, 9 January 2007 (UTC)
thread_title: CompactFlash Out of Date?

message: Tables extracted from SD articles:
               	SD Memory Card	miniSD Card	microSD Card
Width               	24 mm         	20 mm      	11 mm
Length              	32 mm         	21.5 mm    	15 mm
Thickness           	2.1 mm        	1.4 mm     	1 mm
Card Volume         	1,596 mm3     	589 mm3    	165 mm3
Weight              	Approx. 2 g   	Approx. 1 g	Approx. 0.5 g
Operating Voltage   	2.7 - 3.6 V   	2.7 - 3.6 V	2.7 - 3.6 V
Write-protect Switch	YES           	NO         	NO
Terminal Guards     	YES           	NO         	NO
Number of Pins      	9 pins        	11 pins    	8 pins
 Technical comparison
Type                  	MMC                    	RS-MMC                 	MMC Plus          	SecureMMC              	SD                                       	SDIO                       	miniSD                     	microSD
SD Socket             	                       	Mechanical adapter     	                       	                       	                                         	                           	Electro-mechanical adapter 	Electro-mechanical adapter
Pins                  	7                      	7                      	13                     	7                      	9                                        	9                          	11                         	8
Form factor           	Thin                   	Thin/short             	Thin                   	Thin                   	Thick (exceptions possible)              	Thick                      	Narrow/short/thin          	Narrow/short/extrathin
Width                 	24 mm             	24 mm             	24 mm             	24 mm             	24 mm                               	24 mm                 	20 mm                 	11 mm
Length                	32 mm             	18 mm             	32 mm             	32 mm             	32 mm                               	32 mm+                	21.5 mm               	15 mm
Thickness             	1.4 mm            	1.4 mm            	1.4 mm            	1.4 mm            	2.1 mm (exceptions possible)        	2.1 mm                	1.4 mm                	1 mm
SPI mode              	Optional               	Optional               	Optional               	Required               	Required                                 	Required                   	Required                   	Optional
1 bit mode            	                       	                       	                       	                       	                                         	                           	                           	
4 bit mode            	                       	                       	                       	?                      	Optional                                 	Optional                   	Optional                   	Optional
8 bit mode            	                       	                       	                       	?                      	                                         	                           	                           	
Xfer clock            	0–20 MHz    	0–20 MHz    	0–52 MHz    	0–20 MHz?   	0–25 MHz - 0–50 MHz	0–25 MHz        	0–25 MHz?       	0–25 MHz?
Max XFER              	20 Mbit/s         	20 Mbit/s         	416 Mbit/s        	20 Mbit/s?        	100 Mbit/s - 200 Mbit/s        	100 Mbit/s            	100 Mbit/s            	100 Mbit/s
Max SPI XFR           	20 Mbit/s         	20 Mbit/s         	52 Mbit/s         	20 Mbit/s         	25 Mbit/s                           	25 Mbit/s             	25 Mbit/s             	25 Mbit/s
DRM                   	                       	                       	                       	                       	                                         	N/A                        	                           	
User encrypt          	                       	                       	                       	                       	                                         	                           	                           	
Simplified Spec       	                       	                       	                       	Not yet?               	                                         	                           	                           	
Memb cost             	$2500/yr (not required)	$2500/yr (not required)	$2500/yr (not required)	$2500/yr (not required)	$1500/yr (appears required)              	$1500/yr (appears required)	$1500/yr (appears required)	$1500/yr (appears required)
Spec cost             	$500                   	$500                   	?                      	?                      	Member                                   	Member                     	Member                     	Member
Host license          	                       	                       	                       	                       	$1000/yr+memb                            	$1000/yr+memb              	$1000/yr+memb              	$1000/yr+memb
Mem card royalties    	                       	                       	                       	                       	                                         	                           	                           	
I/O card royalties    	N/A                    	N/A                    	N/A                    	N/A                    	N/A                                      	$1000/yr+memb              	N/A                        	N/A
Open source compatible	                       	                       	?                      	?                      	SPI only                                 	SPI only                   	SPI only                   	SPI only
Type                  	MMC                    	RS-MMC                 	MMC Plus          	SecureMMC              	SD                                       	SDIO                       	miniSD                     	microSD
 
Table data compiled mostly from simplified versions of MMC and SDIO specifications and other data on SD card and MMC association web sites. Data for other card variations is interpolated.
Capacity limit in all SD/MMC formats appears to be 128 GB in LBA mode (28-bit sector address).
Most, possibly all, current MMC flash memory cards support SPI mode even if not officially required as failure to do so would severely affect compatibility. All cards currently made by SanDisk, Ritek/Ridata, and Kingmax digital appear to support SPI. Also, MMC cards may be electrically identical to SD cards but in a thinner package and with a fuse blown to disable SD functionality (so no SD royalties need to be paid).
Some MicroSD cards do not support SPI mode.
--70.111.218.254 14:59, 25 December 2006 (UTC)
replies: text: The "Technical comparison" table is Template:MultiMediaCard comparison, it is included in the MMC/SD cards articles. It should be merged into this article. Having duplicate tables with potentially (haven't checked) inconsistent data is not a good solution.--87.162.56.93 (talk) 16:12, 14 December 2007 (UTC)
thread_title:  More info on tables from SD articles 

message: Earlier today I added USB flash drives to this page but User:GreyCat reverted it with no clear comment as to why.  It seems clear to me that USB flash drives ought to be listed in this table.  They are not used in all of the places that other flash formats are and of course aren't generally wholly internal to the device which uses them, but they are often competing in the same kind of space.
Please do discuss this further here before just reverting my change.  Thanks.  - Ian Jackson User:Ijackson.
:Hello ;) Please scroll to the bottom of the page, i.e. #Adding USB flash drive. I've left a detailed comment on particularly why I did that and I've invited you to discuss. Also, please stay logged in for your additions to remain credited to your user, not just IP. --GreyCat 00:27, 4 January 2007 (UTC)
replies: text: I choose not to accept the Wikipedia cookie because I prefer to keep my browsing anonymous as much as possible.  It would be nice if there were a straightforward way to only be non-anonymous for edits but in practice since I always use a fixed IP address used only by other non-abusive people there shouldn't be a problem.  -- Ian Jackson.  13:30, 4 January 2007 (UTC)
replies: text: Wouldn't revealing that you use a fixed IP address, as well as publishing that IP address to the world, and giving out your name as well all sort of run counter to your goal of keeping your browsing anonymous?  Wouldn't your browsing be much more anonymous if you just accepted the cookie so you could post under a pseudonym and not reveal your IP either? Reswobslc 07:22, 9 January 2007 (UTC)
thread_title: USB flash drives

message: I say that USB drives ought to stay as an honorable mention, even if they are not standardly-shaped "cards" in the traditional sense.  To the average Joe, about the only difference between a USB device and any other device is that the USB's lack of standardized shape prevents it from being inserted inside a camera - but that's about it.  All kinds of new hardware (for example, my new Philips plasma TV) can use a USB thumb drive as a memory card for the viewing of photos... how can this not be an example of the same thing SD/CF/MS cards are used for? Reswobslc 16:26, 5 January 2007 (UTC)
replies: text: I hardly believe that "all kinds of new hardware (...) can use a USB thumb drive" when things come to cameras, cell phones, etc, where the memory cards are used traditionally. For example, I don't know a single camera that would allow USB flash drives to be used with it. Please see a bit below for proposed resolution. --GreyCat 00:48, 6 January 2007 (UTC)
thread_title: Third opinion

message: While it might be kinda interesting to have USB drives as a comparison, I see some problems:
# They are not (generally) used as removable storage for consumer electronics
# In many of these tables you can't say anything meaningful about USB, as there is no standardization
# The page is titled "Comparison of memory cards", not "Comparison of portable data storage".  If we include USB flash drives, why not USB microdrives, or for that matter USB hard drive enclosures, floppy disks and ZIP drives?
—Dgiest c 21:47, 5 January 2007 (UTC)
replies: text: I deeply agree with you. May be that would be the best idea - let's create a Comparison of portable data storage that will illustrate whole evolution of portable data storages, including ZIP discs, various floppies, portable HDDs, Firewire drives, CD-ROM/RW, DVD-ROM/-R/+R/-RW/+RW/-RAM, etc? That would be the best option, and we can have there lots of more general columns. --GreyCat 00:48, 6 January 2007 (UTC)

text: As a counter argument I offer the following:
# USB flash memory isn't used in portable devices due to a lack of standardized size which is mandatory for a portable device.  That doesn't put them out of their league though.
# There is plenty of standardization for USB devices.  If there weren't, you'd need a driver for each one.  No, instead a USB flash device must follow a spec called "Mass Storage Class".  (Incidentally, so must USB readers for all of the other devices that are listed here).
# People don't think of USB hard drive enclosures, floppy disks, or zip drives as "memory cards".  But average people do equate USB thumb drives as being memory cards.  They also equate MicroDrives (spinning hard disks in CompactFlash form factor) as being memory cards due to their size, so that blows any sort of pattern.  The only pattern is following the common sense of the lay person, who is Wikipedia's audience, and the lay person would probably appreciate a comparison of a USB "memory card" versus another type, even if the USB device doesn't strictly adhere to the same design goals as a typical memory card.
--Reswobslc 07:34, 9 January 2007 (UTC)
replies: text: Everything's fine, but this article is called "Comparison of memory cards" and, afterall, we're should try to stick to academic style in our wikipedia articles. If some "average Joe" around is calling both "USB flash drive" and "MicroDrive" a "memory card", we can't do so. If we want to make an article that will accomodate needs of average people on comparison of portable storage, I'd strongly suggest making Comparison of portable data storage - that's a neutral name that would suit everybody, and that article won't be burdended with intricate technical details, such as pinouts, chip types, but, instead, it should mention more common ground facts, such as availability, cost per megabyte, popularity, market share, etc. I'll gladly try participating in that article too. --GreyCat 10:04, 9 January 2007 (UTC)
replies: text: What then, from an "academic perspective", constitutes a "card"?  A card is something you play poker with, and only refers to memory thanks to the average Joe.  If this article isn't for Joe, then it should be titled "Comparison of Flash memory modules with standardized sizes".  But really, this article doesn't stand on its own.  It is an offshoot of the Memory card article, which goes as far as to include the "memory cards" for video game consoles such as Playstation and Nintendo's series, as well as floppy disks, Zip disks, MicroDrives, SIM cards for mobile phones, and plenty of others.  I didn't start this dispute, I only started paying attention when an outside opinion was requested.  Unless you want to start including flash-based video game console cards in this article, I wouldn't suggest arguing what does and does not fit the title from an "academic" (aka your) perspective.  The page could probably use a rename to more accurately define its scope. Reswobslc 05:17, 10 January 2007 (UTC)
thread_title: Fourth Opinion

message: * I'm here in response to your RfC.  In looking at the article I see USB drives are linked but aren't listed as a type of "memory card" per se.  This seems appropriate. In my view the most common purposes of each are different -- a USB drive usually serves as removable storage (i.e., floppy or CD substitute), while a memory card usually is installed within a device as part of its mass storage. Doubtless there are overlapping cases but these seem to be the most common usage. Hope this response is useful.   Raymond Arritt 03:48, 10 January 2007 (UTC)
thread_title: Responses to Request for Comment

message: Another thing I think would be vital information for this article to compare is how proprietary each standard is (which greatly affects price).  For example, Memory Stick is made only by Sony and its licensees, while Compact Flash is based on a much more open standard that anyone may use.  To me, that's just as much of a factor as any when considering what kind of memory I'd like to use given a choice. Reswobslc 16:37, 5 January 2007 (UTC)
replies: text: Yes, I agree that it's an important matter and should be reflected somehow. Any detailed ideas on what kind of table / sections we should have? How to measure "proprietarity"? --GreyCat 00:48, 6 January 2007 (UTC)
replies: text:  How about the opposite term, which would be openness.  Useful information would include 1-whether the standard is published or private, and 2-whether manufacturing the device requires payment of licensing fees or royalties, and 3-typical cost per megabyte for the same size of card bought from the same place, so the difference in price that greedy closed companies tack on can be clearly seen for what it is. Reswobslc 07:27, 9 January 2007 (UTC)
thread_title: Proprietary-ness

message: Kingmax say, in this webpage, that they will be making 4 GB micro SD cards.  GoldenMars have 4 GB product available. DanBeale 11:23, 13 February 2007 (UTC)
thread_title:  Micro SD size increased? 

message: The transfer rates for type H xD cards listed on this page are much higher than those listed on the xD card page itself. Which is correct? Arganoid 14:38, 15 February 2007 (UTC)
thread_title: xD card transfer rates

message: The table says, that SD can be upto 137 GB, but the Secure_Digital article claims, that even 2GB are a problem and there was a new standard developed, SDHC, which also maxes out at 32 GB.
--Xerces8 20:06, 11 May 2007 (UTC)
thread_title: SD capacity misleading

message: Why don't you add a table that will make it quite clear that the reader should not invest in e.g., SM over SD.
E.g., units produced, year vs. card type, worldwide. Jidanni (talk) 02:34, 20 December 2007 (UTC)
thread_title:  Hot and not 

message: Is it 2 grams? Same as Memeory Stick Duo? Sounds impossible!  —Preceding unsigned comment added by 206.186.8.130 (talk) 19:00, 20 February 2008 (UTC)
replies: text: Beat me to it! According to SonyStyle.com, the weight is "Approx. 1g" so that doesn't help much. All the other online shops I've checked don't even mention the weight.Corky842 (talk) 05:52, 19 March 2008 (UTC)
replies: text: Memory stick Duo; 1.3 grammes.  M2 card: 0.4 grammes.  This would be 'original research', but if nobody argues, the info can go in by concensus. 86.176.152.185 (talk) 17:04, 11 February 2011 (UTC)
thread_title:  Weight of Memeory Stick Micro (M2) 

message: I'm pretty sure that SD cards have transfer rates up to 20 megaBYTES per second (20 MB/s) and not 20 Megabits per second.  I've seen cards on newegg rated as '133X' which means 133 times the speed of the original CDROM rates.  The original 1x CDROM rate was 1 Kilobyte per second (1 KB/s) according to the wikipedia entry on CDROM which would mean that readily available SD Cards have transfer rates of 133 X 150 Kilobytes per second which is 20 Megabytes per second.
: Further, the quoted speed of Compact Flash (133 MiB/s) sounds incorrect. The 133x advertised for CF is 133 times, which - as above - means approx 20 MiB/s. Some CF are advertised at 120x - perhaps this is Type I - indicating a different speed of around 17.6MiB/s. 58.175.172.192 (talk) 06:25, 11 July 2009 (UTC)
thread_title:  Transfer speeds are not accurate 

message: The width and length column values for microSD and MMCmicro cards should be swapped. If the pins of any of the two cards are facing up, horizontal measurements of these cards are smaller than the vertical measurements.
The "microSD" article (Technical comparison table on the page http://en.wikipedia.org/wiki/MicroSD) correctly states that the width of the microSD card is 11 mm and the length is 15 mm.  —Preceding unsigned comment added by SakiTC (talk • contribs) 13:19, 4 September 2008 (UTC)
thread_title:  Width and length of microSD and MMCmicro cards 

message: The maximum size of microSD was claimed to be 16 GB and was flagged as needing a citation.  I added a reference to SanDisk's 16 GB product page, but realized this page has a separate row for microSDHC; therefore my citation (and the original 16 GB claim) might be incorrect.  I believe the maximum size of the non-HC microSD format is something like 2 GB.  Should the 16 GB claim (along with my citation) be removed? Super_C (talk) 18:24, 13 October 2008 (UTC)
replies: text: After looking a little more, I went ahead and made the change I proposed above.  Because there is a row in the grid showing 16 GB to be the maximum size of microSDHC, I changed the maximum size of microSD to be 2 GB (with a reference to the SanDisk microSD/microSDHC product listing). Super_C (talk) 18:38, 13 October 2008 (UTC)
thread_title:  Maximum size of microSD 

message: I've just been doing a bit of research on this topic and I think the new SDXC (notable for having up to 2TB capacity) format and the SxS should be added. SxS, or a similar card that plugs directly into the ExpressCard slot, will do well in the format wars I think. Benced (talk) 04:54, 9 September 2009 (UTC)
thread_title:  2009 updates - SxS and SDXC 

message: I have a hunch that the Gibibyte article got some numbers wrong. 
Now, the tables using GiB, GB, MiB and MB are a mess. Stick to one common units for the common information, technical units for the technical information, but don't mix the two. Moreover, on the technical table capacity is given in MiBs but transfer speed in MB/s, which is a consumer unit, different to the MiB and misleading. Can someone of the technical minded people correct the numbers and units please?
Don't use GiB units when dealing with consumer relevant details (the 'Common Information' table), or make a separate column detailing the current available capacities in GB and then GiB. Better yet, make a separate paragraph explaining the difference between the two terms with a link to the main article. Keep the two numbers separate. 77.49.88.107 (talk) 10:22, 24 November 2009 (UTC)
thread_title:  Where do they sell those 32,768.00 Gigabyte SD cards? I want one 

message: Why aren't PC Card/PCMCIA/CardBus/JEIDA memory cards not dealt with here?
70.29.211.9 (talk) 12:31, 26 December 2009 (UTC)
replies: text: Probably because they're old and obsolete. There should be a separate article for obsolete memory card types. SmartMedia could be moved there since it's been a dead format for several years. Keep this one just for what's currently in production or compatible with what's currently in production. Bizzybody (talk) 05:58, 19 October 2010 (UTC)
replies: text: Since this is a comparison article, there is nothing wrong with providing the comparison here.  The card can easily be flagged as an obsolete format. 86.176.152.185 (talk) 17:00, 11 February 2011 (UTC)
thread_title:  PC Card/JEIDA 

message: link 4: confused with other link
link 43: dead (404)
Galanom (talk) 22:20, 28 January 2010 (UTC)
thread_title:  links 

message: Shortly before SmartMedia took a HD-DVD type dive, the format was expanded to be capable of 256 meg. Some devices with controllers capable of 256 meg got firmware updates for that capacity, but the cards never showed up, aside from a very small number that command crazy high prices (or used to) if they ever come up for sale. There are adapter cards to use 128 meg or smaller XD cards in devices that use SmartMedia, but the XD socket is bulky and the adapters cannot be used with devices which require a memory card cover/door to be closed in order to function. I've no idea if those adapters will allow a 256 meg XD to be used in a SM device capable of addressing 256 meg SM cards. Bizzybody (talk) 06:04, 19 October 2010 (UTC)
thread_title:  256 meg SmartMedia 

message: The table shows the maximum capacity of the SDHC card as 64GB.  The specification states that the max. size is 32GB.  Although googling 'SDHC 64GB' turns up over 2 million hits, in reality none of the pages that I looked at (including those from the most reputable memory card suppliers) actually lists a 64MB SDHC card.  The large number of hits presumably comes about because 64GB (in the SDXC variant) is listed on the same page as SDHC cards up to 32GB (Google lists pages where both search terms occur anywhere on the page, followed by pages where any (but not all) the search terms appear).  I have tagged the claim in the article, and unless a valid citation is provided for the existence of real 64GB SDHC cards, I shall change the claim to read '32GB'. 86.176.152.185 (talk) 16:58, 11 February 2011 (UTC)
thread_title:  Max capacity of SDHC cards. 

message: Where can one find typical IOPS (IO Operations per Second) for various kinds of memory cards?-96.233.30.57 (talk) 08:47, 8 May 2011 (UTC)
thread_title:  IOPS for memory cards 

message: There's one I recall that was as thin as Smart Media but only about 1/2" wide by about 1.5" long. The cards had only 4 or 6 contacts and one clipped corner at the contact end. The only time I encountered it was a couple of two megabyte cards with a cheap digital camera someone was using to take photos for a website. Bizzybody (talk) 09:47, 19 January 2012 (UTC)
thread_title:  Article for obsolete and obscure removable memory? 

message: In the table in Technical details, all USB versions are grouped together as 4 pin connections.  This is incorrect for USB 3.0.
USB 3.0 is 9 pins, and is backwards compatible with 2.0 (4 pins).  The plug looks almost identical on the host side (A-connector) with the extra 5 pins tucked into the rear of the connector.  (thus the confusion that it is the same pin count as 2.0); it is twice as wide on the client side (Micro B connector).
See the USB 3.0 Wikipedia page.  — Preceding unsigned comment added by Michael Stangeland (talk • contribs) 02:05, 26 March 2014 (UTC)
thread_title:  USB 3.0 is 9 pins 

message: Please can you stop serving the effing mobile version of Wikipedia to devices like tablets.  You only started doing this very recently and unless you can get your script kiddies to understand that most tablets and smartphones have as good resolution as desktop / laptop screens, or better, and don't need that pxy designed-for-ancient-feature-phone mobile version you risk losing many users.  I've just about had it up to my eyeballs with scrolling to the bottom of the screen on an iPad to request the 'desktop' version.
Anyone who sees this, editor or user, please get the message back to whoever performed this recent wrecking action on Wikipedia.  Thank you.
Keep Wikipedia usable.  — Preceding unsigned comment added by 86.130.102.148 (talk) 08:32, 14 July 2014 (UTC)
replies: text: Why are you complaining here about it, seriously?  Very few people see this talk section.  • Sbmeirow • Talk • 14:02, 14 July 2014 (UTC)
thread_title:  Stop serving 'mobile' versions, perlease!  

message: Thanks to whoever wrote this, it's an awesome resource. Anecdotally, I think having a column that displays whether the card has a read-only toggle would be useful. I don't know enough about the subject, and I don't own any SD cards at the moment, so I can't do it myself. Exercisephys (talk) 00:59, 21 July 2014 (UTC)
replies: text: It's already in there... --Matthiaspaul (talk) 08:56, 21 July 2014 (UTC)
thread_title:  Read-only column 

message: This was discussed in 2011 (link) and ended up with two sources being added that supposedly validate the existence of 64GiB SDHC cards, despite the fact that SDHC states the maximum possible is 32GiB.  These are:
* http://www.amazon.com/s/ref=nb_sb_noss?url=node%3D516866&field-keywords=micro+sd+card&rh=n%3A172282%2Cn%3A541966%2Cn%3A172456%2Cn%3A516866%2Ck%3Amicro+sd+card
* http://www.sandisk.com/products/memory-cards/microsd/extreme-uhs-i/?capacity=64GB
Frankly, these sources are a disgrace and should not even be considered for a claim that contradicts information included elsewhere.  The first links to a product search page on Amazon which admittedly includes results for products described as being "64GB" (whether this is a base-2 or base-10 'giga' is unclear in context, so I'd assume the latter) and indeed "128GB" "SDHC" cards, but (1) it is a primary source and is therefore not considered good practice (WP:PRIMARY) and (2) as these cards seem to universally be unbranded it is plausible that they have simply been mislabelled by their manufacturers or vendors.  The second link is a description of features of a manufacturers range of cards that include both SDHC and SDXC, therefore it is not clear what claims pertain to SDHC cards and what to SDXC.
Secondly, there is a claim in the table of a "theoretical maximum" storage capacity of 2 TiB for SDHC cards.  This seems to me to be based entirely on original research; there is no source given, and as the specification apparently states that 32GiB is the maximum size of an SDHC, any larger card is non-conformant to the specification and is therefore (at least in some sense) not an SDHC card at all, so therefore it isn't theoretically possible to have a 2TiB SDHC card.  Or do I misunderstand something? JulesH (talk) 21:02, 1 October 2014 (UTC)
replies: text: I have removed the 64GB claims, as I am almost certain they're wrong.  If somebody can find a non-primary reliable source that describes 64GB SDHC cards as available, please revert my changes, but I cannot see any.  I haven't changed the 2TiB theoretical maximum, as I'm not 100% sure I'm right there. JulesH (talk) 21:14, 1 October 2014 (UTC)
thread_title:  SDHC max capacity (again) 

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thread_title:  External links modified 

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When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
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thread_title:  External links modified 

message: Hello fellow Wikipedians,
I have just modified 2 external links on Comparison of memory cards. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20140209080244/https://www.sdcard.org/consumers/speed/bus_speed/ to https://www.sdcard.org/consumers/speed/bus_speed/
*Added archive https://web.archive.org/web/20100707074356/http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf to http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 21:15, 18 September 2017 (UTC)
thread_title:  External links modified 

message: Hi everyone, I just added information related to PS Vita Memory Card. It's the kind of memory card that works and only works on a Playstation Vita handheld. Despite its look-a-like dimensions and specification to Memory Stick Micro (M2), it's completely proprietary. I added this card to the registry for future reference. You are more than welcome to review my edits, and if you have any question, please feel free to add to comments. --Bill Gong 01:36, 27 June 2018 (UTC)
thread_title:  PS Vita Memory Card 

message: Where is the information on a comparison of speed classes? --KitchM (talk) 19:01, 4 March 2019 (UTC)
thread_title:  Speed Classes