arnd@wuerfel:~/flashbench$ sudo fdisk -lu /dev/sdd

Disk /dev/sdd: 8011 MB, 8011120640 bytes 41 heads, 41 sectors/track, 9307 cylinders, total 15646720 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xd45371da

Device Boot Start End Blocks Id System /dev/sdd1 8064 15646719 7819328 c W95 FAT32 (LBA)

arnd@wuerfel:~ $ lsusb Bus 001 Device 016: ID 18a5:0240 Verbatim, Ltd

arnd@wuerfel:~/flashbench$ sudo dosfsck /dev/sdd1 dosfsck 3.0.9, 31 Jan 2010, FAT32, LFN Free cluster summary uninitialized (should be 244224) /dev/sdd1: 1 files, 1/244225 clusters

arnd@wuerfel:~/flashbench$ sudo ./flashbench -a /dev/sdd --blocksize=1024 --count=32 align 1073741824 pre 544µs on 810µs post 564µs diff 257µs align 536870912 pre 565µs on 811µs post 565µs diff 246µs align 268435456 pre 558µs on 814µs post 564µs diff 253µs align 134217728 pre 558µs on 809µs post 563µs diff 248µs align 67108864 pre 562µs on 816µs post 566µs diff 252µs align 33554432 pre 566µs on 814µs post 566µs diff 248µs align 16777216 pre 568µs on 817µs post 567µs diff 250µs align 8388608 pre 561µs on 799µs post 566µs diff 235µs align 4194304 pre 561µs on 781µs post 551µs diff 225µs align 2097152 pre 561µs on 763µs post 566µs diff 200µs align 1048576 pre 562µs on 762µs post 565µs diff 199µs align 524288 pre 561µs on 763µs post 566µs diff 200µs align 262144 pre 562µs on 762µs post 565µs diff 198µs align 131072 pre 562µs on 746µs post 566µs diff 182µs align 65536 pre 561µs on 729µs post 565µs diff 167µs align 32768 pre 561µs on 764µs post 564µs diff 201µs align 16384 pre 562µs on 762µs post 567µs diff 198µs align 8192 pre 548µs on 657µs post 550µs diff 108µs align 4096 pre 562µs on 657µs post 550µs diff 101µs align 2048 pre 558µs on 648µs post 559µs diff 89.6µs

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=1024 --open-au --open-au-nr=1 --erasesize=4194304 4MiB 13.5M/s 2MiB 4.29M/s 1MiB 12.8M/s 512KiB 4.17M/s 256KiB 11.5M/s 128KiB 3.97M/s 64KiB 4.38M/s 32KiB 11.9M/s 16KiB 2.82M/s 8KiB 1.4M/s 4KiB 713K/s 2KiB 360K/s 1KiB 181K/s

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=32768 --open-au --open-au-nr=1 --erasesize=8388608 8MiB 14.5M/s 4MiB 13.2M/s 2MiB 13.5M/s 1MiB 13.6M/s 512KiB 13.6M/s 256KiB 12.6M/s 128KiB 11.1M/s 64KiB 16.9M/s 32KiB 11.9M/s

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=32768 --open-au --open-au-nr=1 --erasesize=8388608 --random 8MiB 13.7M/s 4MiB 9.02M/s 2MiB 6.16M/s 1MiB 6.24M/s 512KiB 4.05M/s 256KiB 4.54M/s 128KiB 3.8M/s 64KiB 6.52M/s 32KiB 5.97M/s

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=32768 --open-au --erasesize=8388608 --open-au-nr=2 8MiB 13.9M/s 4MiB 13.6M/s 2MiB 13.2M/s 1MiB 13.5M/s 512KiB 13.3M/s 256KiB 12.5M/s 128KiB 11.1M/s 64KiB 15.7M/s 32KiB 11.2M/s

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=32768 --open-au --erasesize=8388608 --open-au-nr=4 8MiB 14.2M/s 4MiB 13.3M/s 2MiB 13.3M/s 1MiB 13.3M/s 512KiB 13.2M/s 256KiB 12.2M/s 128KiB 11.2M/s 64KiB 15.2M/s 32KiB 11.2M/s arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=32768 --open-au --erasesize=8388608 --open-au-nr=6 8MiB 13.9M/s 4MiB 13.3M/s 2MiB 13.1M/s 1MiB 13.4M/s 512KiB 13.4M/s 256KiB 12.3M/s 128KiB 11.2M/s 64KiB 15.3M/s 32KiB 11.3M/s

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=8388608 --open-au-nr=8 --blocksize=1048576 8MiB 13.5M/s 4MiB 13.4M/s 2MiB 13.2M/s 1MiB 13.3M/s arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=8388608 --open-au-nr=10 --blocksize=1048576 8MiB 13.6M/s 4MiB 13.3M/s 2MiB 13.2M/s 1MiB 13.3M/s arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=8388608 --open-au-nr=12 --blocksize=1048576 8MiB 13.5M/s 4MiB 13.4M/s 2MiB 13.1M/s 1MiB 13.3M/s arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=8388608 --open-au-nr=14 --blocksize=1048576 8MiB 13.4M/s 4MiB 11.7M/s 2MiB 9.3M/s 1MiB 5.71M/s arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=8388608 --open-au-nr=16 --blocksize=1048576 8MiB 13.8M/s 4MiB 10.6M/s 2MiB 5.95M/s 1MiB 4.14M/s

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=512 --open-au --erasesize=8388608 --open-au-nr=13 8MiB 13.4M/s 4MiB 12.4M/s 2MiB 10.8M/s 1MiB 8.27M/s 512KiB 5.8M/s 256KiB 3.5M/s 128KiB 1.96M/s 64KiB 1.1M/s 32KiB 560K/s 16KiB 2.6M/s 8KiB 1.29M/s 4KiB 655K/s 2KiB 330K/s

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=8192 --open-au --erasesize=8388608 --open-au-nr=12 --random 8MiB 13.4M/s 4MiB 9.03M/s 2MiB 6.17M/s 1MiB 6.24M/s 512KiB 4.06M/s 256KiB 4.54M/s 128KiB 3.8M/s 64KiB 6.47M/s 32KiB 5.79M/s 16KiB 2.72M/s 8KiB 1.33M/s

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=8192 --open-au --erasesize=8388608 --open-au-nr=13 --random 8MiB 13.5M/s 4MiB 8.81M/s 2MiB 5.43M/s 1MiB 3.81M/s 512KiB 2.27M/s 256KiB 1.34M/s 128KiB 860K/s 64KiB 481K/s 32KiB 229K/s 16KiB 2.46M/s 8KiB 1.23M/s

arnd@wuerfel:~/flashbench$ sudo ./flashbench /dev/sdd --blocksize=8192 --open-au --erasesize=8388608 --open-au-nr=12 --random --offset=$[20 * 1024 * 1024] [sudo] password for arnd: 8MiB 10.5M/s 4MiB 5.59M/s