On Tuesday 26 July 2011, Ajax Criterion wrote:
Hi again,
I was able to recover *most* of the test results for my Kingston drive. I've stitched this together from several chunks that were recovered, so bits and pieces are missing throughout, but most of the info is here.
Ok, thanks! I've added the results to the wiki page.
Unfortunately, I wasn't able to retrieve the full ouput of the 'flashbench -a' test -- I suppose you can take my word that it has a 4MB erase size until I can run some more tests on this drive :)
That's ok, the measurements all look consistent. However, one is missing:
bash-4.1# ./flashbench -O --open-au-nr=2 /dev/sdb 4MiB 13.7M/s 2MiB 13.2M/s 1MiB 13.5M/s 512KiB 14M/s 256KiB 13.5M/s 128KiB 11.2M/s 64KiB 15.1M/s 32KiB 10.8M/s 16KiB 6.58M/s
bash-4.1# ./flashbench -O --open-au-nr=10 /dev/sdb 4MiB 13.3M/s 2MiB 12.1M/s 1MiB 10.6M/s 512KiB 8.78M/s 256KiB 13.5M/s 128KiB 11.1M/s 64KiB 15M/s 32KiB 11M/s 16KiB 6.55M/s
This indicates that the device can actually handle ten erase blocks just fine. I've entered the data as >=10 erase blocks, but it would be interesting to see if ten is actually the limit or if it can do more than that. Same for the --random tests.
bash-4.1# ./flashbench --findfat --fat-nr=5 --erasesize=$[4 * 1024*1024] --random --blocksize=512 /dev/sdb 4MiB 3.37M/s 5.42M/s 13.3M/s 13.4M/s 13.3M/s 2MiB 5.11M/s 5.04M/s 9.25M/s 9.17M/s 9.25M/s 1MiB 5.24M/s 5.86M/s 5.86M/s 5.85M/s 5.86M/s 512KiB 5.29M/s 3.77M/s 3.77M/s 3.76M/s 3.77M/s 256KiB 2.92M/s 5.48M/s 5.49M/s 5.49M/s 5.48M/s 128KiB 4.49M/s 4.61M/s 4.6M/s 4.6M/s 4.6M/s 64KiB 5.86M/s 3.59M/s 3.59M/s 3.59M/s 3.6M/s 32KiB 5.62M/s 4.16M/s 4.17M/s 4.17M/s 4.16M/s 16KiB 4.1M/s 2.82M/s 2.82M/s 2.82M/s 2.81M/s 8KiB 1.35M/s 1.33M/s 1.33M/s 1.33M/s 1.33M/s 4KiB 706K/s 836K/s 837K/s 836K/s 837K/s ^C bash-4.1# ./flashbench --findfat --fat-nr=5 --erasesize=$[4 * 1024*1024] --blocksize=512 /dev/sdb 4MiB 4.94M/s 13.4M/s 13.3M/s 13.3M/s 13.3M/s 2MiB 4.98M/s 13.2M/s 13.2M/s 13.2M/s 13.2M/s 1MiB 5.05M/s 13.5M/s 13.4M/s 13.5M/s 14.3M/s 512KiB 5.15M/s 13.7M/s 13.7M/s 13.8M/s 13.7M/s 256KiB 5.07M/s 13.7M/s 13.7M/s 13.8M/s 13.7M/s 128KiB 4.63M/s 11.1M/s 11.1M/s 11.2M/s 11M/s 64KiB 5.17M/s 16.1M/s 16.1M/s 16M/s 16M/s 32KiB 5.65M/s 11.9M/s 11.9M/s 11.9M/s 11.9M/s 16KiB 4.32M/s 7.33M/s 7.35M/s 7.35M/s 7.37M/s 8KiB 2.02M/s 2.95M/s 2.96M/s 2.95M/s 2.94M/s 4KiB 1.54M/s 1.54M/s 1.55M/s 1.54M/s 1.55M/s 2KiB 769K/s 812K/s 813K/s 815K/s 811K/s 1KiB 417K/s 407K/s 418K/s 418K/s 418K/s
This is very interesting: Apparently this stick in fact optimizes the first erase block for the FAT, which most USB sticks do not.
Again, if there are more tests you'd like to have done, just let me know and I can run them when I have a chance. I think I've rescued about as much as I can from the drive, so I should have it operational again soon :)
Did you accidentally lose data when writing to the device? I'm honestly sorry about never having put a bigger warning into the tool.
Arnd