[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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