[clug] OT - USB flash timings

steve jenkin sjenkin at canb.auug.org.au
Sat Jun 16 05:56:08 GMT 2007


I got a question from a cousin about his new USB flash taking an age to
copy something...
Thought the group might be interested...

Seems standard devices are very sensitive to block size on *write* - but
not on read...

For some good reference material: Wikipedia and Kingston:-

<http://www.kingston.com/products/pdf_files/FlashMemGuide.pdf>
<http://en.wikipedia.org/wiki/Flash_Memory>


Device used for these tests: 4Gb Kingston 'Data Traveller'.
512Mb file used for most timings (1Mb for 1b test).  No FileSystem Cache
issues.

> USB Flash - WRITE performance
>    1b    88,827 bytes/sec
>    8k 1,035,601 bytes/sec
>  128k 3,819,827 bytes/sec
>  512k 4,155,635 bytes/sec
>
> USB Flash - READ performance
>    8k 9,467,708 bytes/sec
>   16k 9,448,265 bytes/sec
>   32k 9,386,199 bytes/sec
>   64k 9,475,763 bytes/sec
>  128k 9,466,469 bytes/sec
>  256k 9,453,077 bytes/sec
>  512k 9,415,421 bytes/sec
> 1024k 9,482,868 bytes/sec
Hope this is interesting/helpful.

regards
stevej

-- 
Steve Jenkin, Info Tech, Systems and Design Specialist.
0412 786 915 (+61 412 786 915)
PO Box 48, Kippax ACT 2615, AUSTRALIA

sjenkin at canb.auug.org.au http://www.canb.auug.org.au/~sjenkin



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