[Nook Color General] Blue6IX:
Thread Navigation:

Post 01 - Introduction, what this thread is about.

Post 02 - Benchmark Software, Memory Specifications.

Post 03 - Hardware: Computer, MicroSD cards, and Adapters/Readers.

Post 04 - Step by Step Procedures.

Post 05 - Results: Initial Test

Post 06 - Results: Test 2

Post 07 - Results: Averages

Post 08 - Results: Averages: SanDisk

Post 09 - Review/Questions/Notes.

Post 10 - Reserved

(Link to single post, reference purposes. Post 01 to reload whole thread.)

Test results (baseline part 2)

Direct Comparison of SD Adapter speed vs. USB Reader speed.

250 of 250 tests run.

-5 SanDisk class 4, 8 Gig MicroSD cards.

-5 SanDisk MicroSD to SD card Adapters.

-5 SanDisk MicroSD USB Readers.

Tested memory cards one at a time in each adapter/reader, per procedure listed above.

Reformat and re-install of windows after all cards tested in each adapter. Repeated 5 times total. Each time between formatting was one segment.

Again, averages truncated (not rounded) to 3 places past the decimal before averaging again.

Averaged the results as such:

-listed raw results in spreadsheet, averaged all SD Adapters per segment, and all USB Readers per segment. This gave me 5 SD Adapter averages per card, and 5 USB Reader averages per card.

This is the first spreadsheet called "Test 2". Each card is it's own page.

-Took those averages and laid them out in a new spreadsheet called "Averages".

-I then averaged together the SD Adapter and USB Reader averages per card, found on the page "All Results" in the "Averages" spreadsheet.

-Those numbers were copied forward to the page "Segment Averages" in the "Averages" spreadsheet. I once again averaged them together to give me a combined average, per segment.

-These segment averages were copied over to the last page of the spreadsheet, called "Combined Averages". These are the numbers I was working for.

-The Segment Averages were splayed out and compared to each other, showing the difference in SD Adapter speed vs. USB Reader speed. The results were pretty consistent.

-The Segment Averages were also averaged together to give me a 'grand total' for SD Adapter speed and USB Reader speed.

Some averages are laid out in code blocks below for casual viewing, but there is much more in the spreadsheets for anyone interested.

(also, the spreadsheets are formatted with color for easy viewing)

Grand Total Combined Averages:

Total Combined Average, SD
Memory Card:	SanDisk C4 8G
Adapter:	SD
Type:	Read	Write
Sequential	7.009	4.945
Random	6.905	3.055
Random 4KB (QD=1)	1.395	0.691
Random 4KB (QD=32	1.373	0.655

Total Combined Average, USB
Memory Card:	SanDisk C4 8G
Adapter:	USB
Type:	Read	Write
Sequential	8.884	5.117
Random	8.679	2.736
Random 4KB (QD=1)	1.48	0.742
Random 4KB (QD=32	1.441	0.719

Grand Total Combined Averages: (Side by Side)

Combined Average, Read, Side by Side
Memory Card:	SanDisk C4 8G
Adapter / Reader:	SD	USB
Type:	Read	Read
Sequential	7.009	8.884
Random	6.905	8.679
Random 4KB (QD=1)	1.395	1.48
Random 4KB (QD=32	1.373	1.441

Combined Average, Write, Side by Side
Memory Card:	SanDisk C4 8G
Adapter / Reader:	SD	USB
Type:	Write	Write
Sequential	4.945	5.117
Random	3.055	2.736
Random 4KB (QD=1)	0.691	0.742
Random 4KB (QD=32	0.655	0.719

Total Combined Averages by Segment: (Side by Side)

Combined Average, Read, By Segment (Side by Side SD / USB)
Memory Card:	SanDisk C4 8G
Segment:	1	2	3	4	5
Adapter / Reader:	SD	USB	SD	USB	SD	USB	SD	USB	SD	USB
Type:	Read	Read	Read	Read	Read	Read	Read	Read	Read	Read
Sequential	6.827	8.884	7.051	8.886	7.059	8.884	7.053	8.879	7.058	8.887
Random	6.724	8.683	6.943	8.67	6.949	8.686	6.952	8.676	6.959	8.683
Random 4KB (QD=1)	1.391	1.476	1.399	1.476	1.397	1.481	1.396	1.486	1.396	1.485
Random 4KB (QD=32	1.371	1.441	1.371	1.439	1.374	1.446	1.375	1.442	1.375	1.44

Combined Average, Write, By Segment (Side by Side SD / USB)
Memory Card:	SanDisk C4 8G
Segment:	1	2	3	4	5
Adapter / Reader:	SD	USB	SD	USB	SD	USB	SD	USB	SD	USB
Type:	Write	Write	Write	Write	Write	Write	Write	Write	Write	Write
Sequential	4.832	5.049	4.966	5.136	4.954	5.113	4.975	5.141	5	5.15
Random	2.838	2.693	2.886	2.742	3.77	2.737	2.879	2.758	2.904	2.752
Random 4KB (QD=1)	0.698	0.759	0.713	0.746	0.604	0.735	0.726	0.739	0.716	0.735
Random 4KB (QD=32	0.66	0.716	0.653	0.715	0.6	0.729	0.691	0.718	0.674	0.72

We can see quite clearly that the USB Reader showed the card at a consistently faster speed then the SD Adapter did.

The data in these spreadsheets can also be used to show a great many other things, which is one reason why I made sure to lay it out as clearly as I could.

As before, the original benchmark results generated by the program are saved to notepad files, by memory card, in folders according to segment. (test2.zip)

It was a total of 2000 numbers I transferred to the first spreadsheet. I checked my work but the possibility exists that I made a mistake somewhere. If someone notices please post below so I can correct - Thanks!

*Note: I switched the SanDisk C4 8G (1) and (2) cards from the first round of testing to the second. Since card (2) tested consistently faster then card (1), I made it the new card (1) and the slower one became the new card (2).

This worked out well, since the rest of the cards tested about the same as the new card (2), with one the new card (1) standing out above the rest in speed. It made it easier to read the results as well.

- 6/13: uploaded individual files while on vacation, zipped it together like the prior test and re-uploaded that zip as the attachment to this test.