CompactFlash, SD, MMC, USB flash storage. Anything that does not have moving parts inside.
April 28th, 2015, 15:35
Is it normal for this device to have such big discrepancies between read and write? Firmware up to date, everything installed and normal, it just doesn't want to work. Am i missing something ?
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April 28th, 2015, 20:52
I have never bothered to familiarise myself with the numbers, as flash varies so much. but reading flash is always a lot quicker than writing. same with USB drives, SD Cards(these often have speeds on the labels/packaging). reading Flash is straightforward. reading and writing are different electronically, and operating system-wise in flash.
April 28th, 2015, 22:12
Would such a symptom be consistent with a drive that was running out of spare blocks?
Does the SMART report look OK?
April 29th, 2015, 4:00
It's brand new...no problems in SMART
May 5th, 2015, 18:49
can we have Crystaldiskinfo report ?
May 5th, 2015, 23:43
Hi, thank you for your input, but the problem has been solved. The client returned this item and exchange it.
May 6th, 2015, 4:51
Hello nicolae788
For this model of SSD,
A> You are getting quite good performance numbers.
B> for the lower capacity model (60GB) This is normal..
This is a generation 1 Sandforce SSD which uses Dynamic write compression, which means your write speed will vary depending on how compressible the data is that you write to it.
AS-SSD writes incompressible data for its benchmark stream and so you are looking at the worst case write scenario. (this is the performance you would get writing a large MP4 file or similar)
With compressible data (big txt files or documents) it could jump up to 150 / 200 MB/s
Unfortunately on the 60GB model you are bottle-necked by the fact that internally the drive only uses 2 write channels. the 120GB+ uses 4 and so the write performance increases exponentially.
hope this helps
Mark
May 6th, 2015, 5:15
Hi Mark,
Thank you very much for your information. It surely made some light on the subject, thank you very much, you are very kind. At least now i have something to relate to the data i received in AS SSD benchmark.
May 6th, 2015, 5:58
Thank you very much @fzabkar. Interesting article.
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