yashsingh1/xdaforums huggingface dataset:
[HD7 General] Wolfman017:
Hi,

I received a new MicroSD for my HD7 : Sandisk SDSDQM-032G-B35 (Class 4)

And it works great. It has been added to the compatibility list.
[HD7 General] dorianmuthig:
That card is sold as a class 2 card (even though, it's a class 4 card), they must've changed the label print, if yours says class 4 on it.

I also saw you listed it twice. The A at the end of the model number only means a transflash adapter (for using the card in a full size SD card device) is included.

And the SDSDQ-023G-J35(A) is a class 4 card sold in Asian markets. You might have gotten the class rating mixed up, perhaps?
[HD7 General] Wolfman017:
The "Class" information seems strange to me... it does not seem to be related with the reference of the card.

If I read what you say, the two working models are Class 4 cards ... but the first card I used for the tutorial was a Class 2 card (but I don't remember the reference).

I will correct the Class information of my compatibility list. But it would be great if the people who upgraded their HD7 could confirm the model number of their card, and the Class number which is written on the card.
[HD7 General] elyl:
Just bought a SDSDQM-032G-B35N off Amazon UK. It was advertised as a Class 2 SDSDQM-032G-B35, but it's the N version I've been sent, and it's labelled as Class 4.

Packaging looks genuine, no SD adaptor, barcode checks out, but seems a couple of people are saying this is garbage for the HD7. Has anyone had any luck with it, or should I return it?
[HD7 General] dorianmuthig:
Put the card into a HighSpeed USB2.0 card reader and attach it to your computer. Format your SD card using the SD format utility from http://www.sdcard.org/consumers/formatter_3/ to FAT32. Download CrystalDiskMark 3 from http://crystalmark.info/download/index-e.html and run it. Select the drive letter of your SD card, 1 Pass and 4000MB, then click on the "All" button to run all tests. After the tests completed, select Edit -> Copy. Then create a new reply to this thread, paste the text you just copied to your clipboard into the input field and post it.

I will then tell you if your card is suitable.
[HD7 General] elyl:
Will do, as soon as I get confirmation from the Amazon marketplace seller that I can return it after the packaging has been opened. Don't want to be stuck with a 60 quid useless piece of silicon :rolleyes:
[HD7 General] zeka1974:
Just get my card today and made the change a few hours ago.

Everything runs fine with this model :D

The class marked in the card is 4.

Thanks,

Santos
[HD7 General] elyl:
Does the packaging say SDSDQM-032G-B35 or SDSDQM-032G-B35N above the barcode? (or something else?)
[HD7 General] zeka1974:
It says only SDSDQM-032G-B35
[HD7 General] zeka1974:
Hi guys,

Just want to put a dummy question :)

I can say that I have a lot of MP3 and Videos in the card for the moment

With my original card (16GB) I have this results with WP Bench (you can find this app in the Market)

Data Memory 13.07 MB/s Storage 3.92 MB/s

With this new card I have this: Data Memory 13.07 MB/s Storage 0.74 MB/s

Is this normal??

The process of changing the card went all fine but I notice sometimes (few) a lag in the phone.

Thanks,

Santos
[HD7 General] dorianmuthig:
That's 60 GBP, right? I get those SDSDQM-032G-B35 cards for 50.83 EUR a pop, including that steep 19% sales tax (excluding shipping, but an envelope is like half a buck). Even less if I buy them by the hundreds or thousands, and that's retail. Bulk could be even less...

Wow, they really do charge that much... http://www.idealo.co.uk/compare/1208604/sandisk-microsdhc-card-32-gb-class-2.html =o

No, this is not normal, it is also a 0.8MB random read by default (files) which is bad because SD cards use 512K or 1024K blocks which can be adressed simultaneously (up to a certain amount) with 4K data blocks in them which can be adressed individually. Benchmarking sequential data block size should therefore be either a multiple of 4K, 8K 512K or 1024K. I just tried that app. My phone is filled with music, videos, podcasts, pictures and apps, ~6GB are free. The benchmark results I get vary each time I perform the test between 2.91MB/s and 4.27MB/s of write speed. Since this is like a sequential write speed test, and for general performance (except video recording), random read speed is slightly more important (writes can be cached and performed when idle), you may have a bad card, but you should be fine. Get the card replaced if you're unhappy.

The card I use is a SDSDQM-032G-B35 class 2 microSD card.
[HD7 General] zeka1974:
I tested the phone for an hour last evening and I see that the freezes that for 2 or 3 times happened dissapear.

Play some games, heard some music and videos and everything went fine without delays or problems.

With WP Bench I get same results 0.8/0.7/1.0MB/s but strangelly this is not affecting the performance but I will try another thing, I will take off the card, format it in PC and then use it again in the phone.

Thanks,

Santos
[HD7 General] enyaj:
B35N is going to lag
[HD7 General] elyl:
Where do you buy the cards from?
[HD7 General] dorianmuthig:
This won't make a difference unless you have a PCI to SDA host controller with native secure digital features and use the SD card formatter from sdcard.org with the secure erase method (similar to TRIM on SSDs).

When you do a hard reset, the phone just deletes the user area in the device memory and changes the security key for the SD card (secure quick erase).

A retailer in Germany http://www.idealo.de/preisvergleich...04_-microsdhc-card-32-gb-class-2-sandisk.html, by the hundreds from a distributor like Ingram Micro or Avnet and its subsidiaries like Bell Micro or by the thousands directly from SanDisk.
[HD7 General] sirtom95:
problem

Hu guys,

i got problem: bought sandisk 32GB, SDSDQM-032G-B35, tried mount it in, but phone is just keep saying to me that its no compatible.

Anybody has clue where should be the problem?

thx

T
[HD7 General] dorianmuthig:
If you replaced your card, you need to reset your phone.

Make sure you have gotten a genuine card, if it's a genuine card and you encounter a problem, return the card and have them send you a new one. They come with a 5 year warranty in most regions, 2 years in others.
[HD7 General] sirtom95:
yep, i did restart, card looks ok in camera or pc and its SanDisc...
[HD7 General] dorianmuthig:
No, not restart, you need to reset the phone to factory settings.

You can do this via the following two ways:

1. Power on the phone (if it was powered off), go into Settings -> about and click the reset your phone button and follow the instructions.

2. Power off the phone (if it is powered on), press and hold both volume buttons and power on the phone. Keep pressing the volume buttons until blue text on gray background with further instructions appear. Follow the instructions to reset your phone.
[HD7 General] JesusFreak316:
http://pocketnow.com/windows-phone/sandisk-lists-five-samsung-focus-compatible-microsd-cards Interesting that those contradict what's on this thread. I wonder if Sandisk just wants us to buy their new cards.
[HD7 General] sirtom95:
yes sorry mistype - I mean reset to factory settings

in short I did everything exactly from 1st page manual, but card dont work
[HD7 General] dorianmuthig:
That post is from November 16th 2010, and SanDisk pulled the list within a week, due to word from Microsoft that they weren't adequate after all. Microsoft never published the list it created via their testing and decided to only tell hardware vendors planning on using SD card memory instead of NAND. The only sucessfully tested SD cards ended up being either Samsung or SanDisk/Toshiba made. You can't buy Samsung cards in retail, which is why you're best off with the SanDisk cards. You can also test the cards yourself and post the results, if you want to take that risk, but even if a card from another vendor is fast enough, the secure digital adapter in the phone may not work with it. SanDisk is pretty much your safe bet, and that's it. There's no weird or shady marketing going on. I don't work for SanDisk Corporation/SanDisk International, Ltd. or whatever they're called in your region. I'm pretty sure the OP doesn't either.

Ensure you pushed it into the slot in the phone until you hear a slight clicking sound. If really everything is fine with both phone and you tried everything, return the card and ask for a replacement.
[HD7 General] sirtom95:
hm, lookes like I´ll have to go this way :(

thnx anyway
[HD7 General] JesusFreak316:
Yeah, just saying. I know they took it down shortly after but I would assume they must have done some testing to make that list in the first place. Just found it odd. I'm basically trying to decide between link and link. The first one's $13 cheaper but the second is guaranteed to work with WP7 as it's a B35. Thing is, as I'm an HD2 owner WP7 compatibility isn't a must, just something that would be nice to have. Hmm, decisions decisions.
[HD7 General] dorianmuthig:
Actually, they both don't say what model number they have. Also, get one in retail packaging, this way you get your 5 year warranty on the card and can have it replaced if something goes wrong with it.
[HD7 General] JesusFreak316:
The second one does in the product description. Says SDSDQM032GB35A and the posted picture is exactly the same as on the first post of this thread. Hmm, now that I look at it, the second one has a 20% restocking fee for returns and the first has none. I think I'll order the first one, check the model, post it here, and return it if it's bad.
[HD7 General] dorianmuthig:
You could also pick any of these: http://www.amazon.com/gp/offer-listing/B003HIWHN0/
[HD7 General] elyl:
OK, results are in:

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 7.977 MB/s

Sequential Write : 5.452 MB/s

Random Read 512KB : 7.904 MB/s

Random Write 512KB : 0.431 MB/s

Random Read 4KB (QD=1) : 2.617 MB/s [ 638.8 IOPS]

Random Write 4KB (QD=1) : 0.996 MB/s [ 243.1 IOPS]

Random Read 4KB (QD=32) : 2.403 MB/s [ 586.8 IOPS]

Random Write 4KB (QD=32) : 0.823 MB/s [ 200.9 IOPS]

Test : 4000 MB [F: 0.0% (0.0/29.7 GB)] (x1)

Date : 2011/05/05 23:08:42

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

I notice the 512KB write is slow. What would you say is an acceptable speed range for this (and the other) stats?

I tried running a few iterations of just the 512KB tests on smaller blocks of data, and it hit up to about 1.7MB/s, and was averaging about 1.1MB/s, obviously a little bit better. Any reason why you pick a 4GB block size to check with?
[HD7 General] JesusFreak316:
How do you know that's a B35 or other compatible one? The non-working SDSDQ-032G-E11M also starts with the same set of numbers; they leave the last few out. If the one I get is bad I'll try that one next.

Edit: I went ahead and ordered that one too. Once I get them in a couple days I'll check the model numbers of both and post them here but can't open them or else I can't return them.
[HD7 General] dorianmuthig:
Yes, the 512K random write is too slow. It should at least be the number of MB/s of your SD card class rating. If it isn't, your card is bad, return it.

I chose a 4GB block, because it is the largest block you can pick. Ideally you should test the speed over the entire storage space of the card, especially for the random read/write tests. The test will show you average values. If you choose a smaller block size the results in random performance may appear better because sequential operations occur more often. Your card will work fine, if you always keep it half empty to avoid fragmentation, but actually it's too slow for video recording if it's filled with small files, like music, pictures and apps.

You can use it, if the phone will recognize it, but I wouldn't recommend it.

You can read their item descriptions to see which model number it is. They're all genuine cards in retail packaging. You can usually send them back free of charge for replacement within two weeks, if you got the wrong one.
[HD7 General] JesusFreak316:
Ok, currently testing http://www.amazon.com/SanDisk-32GB-microSDHC-Memory-Package/dp/B003WGJYCY/ref=pd_sim_e_2. It came in a resealable pack so I can return it if it doesn't test well. The other one, http://www.amazon.com/SanDisk-Flash-microSDHC-Memory-SDSDQM-032G/dp/tech-data/B003HIWHN0/ref=de_a_smtd, has the model on the package obscured by a bar code sticker. Thanks to my HD2's lamp though shining through the front I was able to confirm it's a B35A. Waiting on the test of the other one to finish.

Edit: Results of the bulk package card:

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 12.787 MB/s

Sequential Write : 5.350 MB/s

Random Read 512KB : 11.462 MB/s

Random Write 512KB : 4.694 MB/s

Random Read 4KB (QD=1) : 1.224 MB/s [ 298.8 IOPS]

Random Write 4KB (QD=1) : 0.078 MB/s [ 19.0 IOPS]

Random Read 4KB (QD=32) : 1.155 MB/s [ 281.9 IOPS]

Random Write 4KB (QD=32) : 0.032 MB/s [ 7.7 IOPS]

Test : 4000 MB [I: 0.0% (0.0/29.7 GB)] (x1)

Date : 2011/05/08 16:05:20

OS : Windows 7 Home Premium Edition [6.1 Build 7600] (x64)

Well, I know which one I'm keeping. (Hint, not the one with the crappy 4KB scores.)
[HD7 General] elyl:
Um, you only posted one set of results! :confused:
[HD7 General] dorianmuthig:
The 4K read and write performance of that card you tested are both too slow. Random write is just barely too slow for the minimum requirement, but you'd want the most you can get. You should not use that card with Windows Phone.

Look here: http://xdaforums.com/showpost.php?p=10354934

I already took care of this.
[HD7 General] JesusFreak316:
Btw, I tested it in my laptop's card reader. Could that possibly skew the data since I'm not using a usb adapter?
[HD7 General] dorianmuthig:
No, most laptop card readers are USB2.0 SDHC or SDXC card readers. If your laptop card reader is an integrated SDA host adapter, that's even better. You just can't use a USB 1.1 SD card reader.
[HD7 General] JesusFreak316:
Yeah, that's what I figured; if it was bandwidth limited it probably wouldn't even handle 12MB/s.

Benchmark for the B35A:

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 9.343 MB/s

Sequential Write : 4.471 MB/s

Random Read 512KB : 7.599 MB/s

Random Write 512KB : 0.501 MB/s

Random Read 4KB (QD=1) : 0.145 MB/s [ 35.4 IOPS]

Random Write 4KB (QD=1) : 0.129 MB/s [ 31.4 IOPS]

Random Read 4KB (QD=32) : 2.430 MB/s [ 593.3 IOPS]

Random Write 4KB (QD=32) : 1.201 MB/s [ 293.2 IOPS]

Test : 4000 MB [I: 0.0% (0.0/29.7 GB)] (x1)

Date : 2011/05/08 22:09:29

OS : Windows 7 Home Premium Edition [6.1 Build 7600] (x64)

I wonder why my random write's so slow. Maybe it was a fluke; formatting and trying again.

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 9.497 MB/s

Sequential Write : 4.703 MB/s

Random Read 512KB : 10.162 MB/s

Random Write 512KB : 0.625 MB/s

Random Read 4KB (QD=1) : 2.261 MB/s [ 552.1 IOPS]

Random Write 4KB (QD=1) : 1.249 MB/s [ 304.9 IOPS]

Random Read 4KB (QD=32) : 1.515 MB/s [ 369.9 IOPS]

Random Write 4KB (QD=32) : 0.716 MB/s [ 174.8 IOPS]

Test : 4000 MB [I: 0.0% (0.0/29.7 GB)] (x1)

Date : 2011/05/08 23:18:39

OS : Windows 7 Home Premium Edition [6.1 Build 7600] (x64)

Not much better. :/ The 4KB results are pretty good but the random write is worrisome.
[HD7 General] dorianmuthig:
That's a class 2 card, if that's not at least 2MB/s you got a bad card. Also, it should be 4MB/s with that model.

As for the rest, it'll work fine, but for 720p video recording you really need the 64-512K write speed to be 2MB/s and up.
[HD7 General] godlyman:
I only can get SanDisk SDSDQ _032G_P36M in my country, any idea if this work with HD7?
[HD7 General] zeka1974:
Hi,

Just changed my 32GB in store for a new one with same reference SDSDQM-032G-B35 and the results are this:

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 10.664 MB/s

Sequential Write : 5.554 MB/s

Random Read 512KB : 10.358 MB/s

Random Write 512KB : 0.489 MB/s

Random Read 4KB (QD=1) : 2.101 MB/s [ 512.8 IOPS]

Random Write 4KB (QD=1) : 1.065 MB/s [ 260.0 IOPS]

Random Read 4KB (QD=32) : 1.969 MB/s [ 480.8 IOPS]

Random Write 4KB (QD=32) : 1.126 MB/s [ 274.9 IOPS]

Test : 4000 MB [E: 0.0% (0.0/29.7 GB)] (x1)

Date : 2011/05/09 12:00:44

OS : Windows 7 SP1 [6.1 Build 7601] (x86)

Thanks,

Santos
[HD7 General] GR_mahdi:
I get patriot 16gig microSDHC in my city,do know anybody this work with my phone or no?
[HD7 General] zeka1974:
Just formatted again and the results are the same :mad:

2 cards with the same reference and the values are the same!

No luck for me with this 32GB updating process

Thanks

Santos
[HD7 General] GR_mahdi:
Please help me
[HD7 General] dorianmuthig:
Everything except this is completely fine with your card. What class rating does your card have? The class rating defines the minimum write in MegaBYTES the card has to support.

The card will work fine, though for HD video recording (which phones don't have to support according to Microsoft) the card is too slow and syncing with Zune will be incredibly slow after a certain time of use (fragmentation).

That depends on what type of card that it is, and if the controller in the phone supports it.

Also, you will need to test the SD card's speed. Put the card into a HighSpeed USB2.0 card reader and attach it to your computer. Format your SD card using the SD format utility from http://www.sdcard.org/consumers/formatter_3/ to FAT32. Download CrystalDiskMark 3 from http://crystalmark.info/download/index-e.html and run it. Select the drive letter of your SD card, 1 Pass and 4000MB, then click on the "All" button to run all tests. After the tests completed, select Edit -> Copy. Then create a new reply to this thread, paste the text you just copied to your clipboard into the input field and post it.

I will then tell you if your card is suitable.
[HD7 General] zeka1974:
Hi Dorian,

Is Class 4

I returned today the 1st card that I bought and received a new one with the same class and reference SDSDQM-032G-B35

This is not normal...2 cards and the same bad results

Thanks,

Santos
[HD7 General] cubanito305:
Very nice tutorial. I will definatly do this to my HD7 as soon as I am out of memory. Thank you very much for this helpfull Thread.
[HD7 General] dorianmuthig:
No, this is indeed not normal, but as said, 512K random write for a class 4 card should be 4MB/s or more.

There may be a problem with your card reader or root USB hub, though. Make sure you are not using any other USB devices on the same USB root hub, don't use a hub and attach the card reader directly to your computer. If you are using a laptop computer, plug it into AC power and remove all USB devices except your card reader and try it again.

You can use the card in your phone anyway, if you want, it still satisfies the 4K spec set by Microsoft.

You can't upgrade the storage during use. Upgrading the storage capacity requires factory resetting your phone and loss of all data on the device itself. If you want to upgrade do it sooner than later. There is no quick and convenient way to make a backup of your settings, installed applications, call history and text messages.
[HD7 General] JesusFreak316:
I'm starting to wonder: you sure manufacturers consider 512k as part of the class specification? I can't find anything that says it and that would explain our poor scores if the manufacturer doesn't care about random writes.
[HD7 General] dorianmuthig:
As far as Toshiba/SanDisk go, yes, they use either 64KB, 512KB or 1024KB block adressing in the controller and 4KB block adressing in the NAND flash itself. SD cards use 64KB control blocks.

The class rating defines minimum write speed in MB/s on a heavily fragmented card. Fragmentation can occur through several factors, one of them being obviously the file system and data stored on it, another being the ECC parity and controller block address space. You can read about this on http://www.sdcard.org/developers/tech/speed_class/

Your results are strange, for the simple reason that your 4KB random writes are faster than the 512KB sequential block writes, it should always be the other way around, because that's how parallel adressing works.
[HD7 General] JesusFreak316:
Ok, so I should be able to return it as defective? That's my main concern as to what they consider class 4.
[HD7 General] dorianmuthig:
Yes, you should be able to do that, if you bought it in a store. If they won't accept it, bring your laptop and show them.

Otherwise contact the manufacturer directly via the support site.
[HD7 General] zeka1974:
I'm in contact with Sandisk Support directly to see if the replace my 2nd card.

Altough the rest of the values are good, I understand that the card is not fully functional, and for the price that I've payed I must have a fully functional one.

Thanks for all the help.

Will give feedback as soon Sandisk gives me an appropriate answer.

Thanks,

Santos
[HD7 General] GR_mahdi:
hello

this is my test answer on memory card

so tell me it is suitable for my phone or not?

thank you

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 12.380 MB/s

Sequential Write : 4.963 MB/s

Random Read 512KB : 12.248 MB/s

Random Write 512KB : 0.703 MB/s

Random Read 4KB (QD=1) : 1.901 MB/s [ 464.1 IOPS]

Random Write 4KB (QD=1) : 0.006 MB/s [ 1.5 IOPS]

Random Read 4KB (QD=32) : 2.124 MB/s [ 518.6 IOPS]

Random Write 4KB (QD=32) : 0.005 MB/s [ 1.3 IOPS]

Test : 4000 MB [E: 0.0% (0.0/14.9 GB)] (x1)

Date : 2011/05/10 17:03:35

OS : Windows XP Professional SP2 [5.1 Build 2600] (x86)
[HD7 General] dorianmuthig:
No, the 4K write is too slow.
[HD7 General] zeka1974:
Hi,

Just have this answer from Sandisk support:

Discussion Thread

Response Via Email (Valentin Albu) 05/11/2011 03:47 AM

Dear José,

The random write speed cannot be warranted since this indicator is influenced also by the computer/device with which you are testing the card. Only sequential read/write speeds can be warranted and in your case they both are above 4MB/s. The card does not have a defect and can be considered fit for purpose.

Please refer to your My SanDisk at http://kb.sandisk.com anytime to see all of your incident history and product registration information. You can log in using your email address as your login and the password that you created.

Also, you can visit http://kb.sandisk.com, our online keyword searchable Knowledgebase, to easily find answers to your Technical Support and Customer Service questions for all of SanDisk's products. Simply enter your search terms and our Knowledgebase will search an extensive database of commonly asked questions as well as our online forums at http://www.sandisk.com/sandisk-support/forums to provide you with the most complete answers possible.

Best regards,

Valentin Albu

SanDisk Technical Support