Hi there, I tested a brandnew 8GB SanDisk Extreme SDHC, class 10.
erase block size: 4MB block size: ?? open erase blocks: 6
Bye, Holger
==> /sys/block/mmcblk0/device/block <== ==> /sys/block/mmcblk0/device/cid <== 035344534430384780310a033a00c100 ==> /sys/block/mmcblk0/device/csd <== 400e00325b5900003b377f800a404000 ==> /sys/block/mmcblk0/device/date <== 01/2012 ==> /sys/block/mmcblk0/device/driver <== ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x8 ==> /sys/block/mmcblk0/device/manfid <== 0x000003 ==> /sys/block/mmcblk0/device/name <== SD08G ==> /sys/block/mmcblk0/device/oemid <== 0x5344 ==> /sys/block/mmcblk0/device/power <== ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235800100000000 ==> /sys/block/mmcblk0/device/serial <== 0x310a033a ==> /sys/block/mmcblk0/device/subsystem <== ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=SD08G MODALIAS=mmc:block
Original partition table:
Disk /dev/sdd: 7948 MB, 7948206080 bytes 81 heads, 10 sectors/track, 19165 cylinders, total 15523840 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: 0x00000000
Device Boot Start End Blocks Id System /dev/sdd1 8192 15523839 7757824 b W95 FAT32
./flashbench -a /dev/sdc --blocksize=1024 align 2147483648 pre 1.06ms on 1.41ms post 1.13ms diff 317µs align 1073741824 pre 1.02ms on 1.39ms post 1.14ms diff 308µs align 536870912 pre 937µs on 1.36ms post 1.03ms diff 377µs align 268435456 pre 1.05ms on 1.4ms post 1.12ms diff 310µs align 134217728 pre 1.04ms on 1.41ms post 1.12ms diff 332µs align 67108864 pre 1.02ms on 1.38ms post 1.12ms diff 312µs align 33554432 pre 1.01ms on 1.43ms post 1.11ms diff 373µs align 16777216 pre 1.03ms on 1.4ms post 1.09ms diff 343µs align 8388608 pre 1.15ms on 1.57ms post 1.08ms diff 451µs align 4194304 pre 1.33ms on 1.73ms post 1.33ms diff 396µs align 2097152 pre 1.2ms on 1.21ms post 1.22ms diff 1.92µs align 1048576 pre 1.21ms on 1.22ms post 1.21ms diff 8.04µs align 524288 pre 1.2ms on 1.24ms post 1.22ms diff 30.4µs align 262144 pre 1.21ms on 1.22ms post 1.23ms diff 1.48µs align 131072 pre 1.21ms on 1.23ms post 1.22ms diff 9.99µs align 65536 pre 1.2ms on 1.22ms post 1.21ms diff 9.37µs align 32768 pre 1.21ms on 1.23ms post 1.2ms diff 25.5µs align 16384 pre 1.22ms on 1.23ms post 1.21ms diff 14.3µs align 8192 pre 1.22ms on 1.21ms post 1.22ms diff -10224n align 4096 pre 1.2ms on 1.2ms post 1.2ms diff 2.93µs align 2048 pre 1.22ms on 1.21ms post 1.23ms diff -16677n
RANDOM TESTS ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=1 --random 4MiB 20.5M/s 2MiB 20.3M/s 1MiB 19.8M/s 512KiB 6.35M/s 256KiB 2.37M/s 128KiB 1.16M/s 64KiB 662K/s 32KiB 312K/s 16KiB 257K/s 8KiB 1.66M/s 4KiB 913K/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=2 --random 4MiB 20.2M/s 2MiB 20.3M/s 1MiB 20M/s 512KiB 6.43M/s 256KiB 2.38M/s 128KiB 1.16M/s 64KiB 662K/s 32KiB 312K/s 16KiB 236K/s 8KiB 1.61M/s 4KiB 880K/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=3 --random 4MiB 20.2M/s 2MiB 20M/s 1MiB 19.9M/s 512KiB 6.45M/s 256KiB 2.37M/s 128KiB 1.16M/s 64KiB 662K/s 32KiB 313K/s 16KiB 254K/s 8KiB 1.58M/s 4KiB 865K/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=4 --random 4MiB 20.4M/s 2MiB 20.3M/s 1MiB 20.1M/s 512KiB 6.38M/s 256KiB 2.38M/s 128KiB 1.16M/s 64KiB 662K/s 32KiB 312K/s 16KiB 245K/s 8KiB 1.58M/s 4KiB 864K/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=5 --random 4MiB 20.4M/s 2MiB 20.2M/s 1MiB 20.2M/s 512KiB 6.44M/s 256KiB 2.37M/s 128KiB 1.16M/s 64KiB 662K/s 32KiB 312K/s 16KiB 264K/s 8KiB 1.58M/s 4KiB 864K/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=6 --random 4MiB 20.4M/s 2MiB 20.2M/s 1MiB 20.1M/s 512KiB 6.38M/s 256KiB 2.37M/s 128KiB 1.16M/s 64KiB 662K/s 32KiB 312K/s 16KiB 241K/s 8KiB 1.52M/s 4KiB 856K/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=7 --random 4MiB 20.4M/s 2MiB 11.1M/s 1MiB 4.4M/s 512KiB 2.06M/s 256KiB 2.24M/s 128KiB 1.15M/s 64KiB 661K/s 32KiB 311K/s 16KiB 259K/s 8KiB 1.45M/s 4KiB 858K/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=8 --random 4MiB 20.4M/s 2MiB 11.2M/s 1MiB 4.37M/s 512KiB 2.05M/s 256KiB 1.01M/s 128KiB 499K/s 64KiB 249K/s 32KiB 125K/s 16KiB 278K/s 8KiB 1.4M/s 4KiB 862K/s
LINEAR TESTS ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=1 4MiB 20.2M/s 2MiB 20.3M/s 1MiB 20.4M/s 512KiB 20.3M/s 256KiB 20M/s 128KiB 19.1M/s 64KiB 19.2M/s 32KiB 16.9M/s 16KiB 13.9M/s 8KiB 9.94M/s 4KiB 7.07M/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=2 4MiB 20.6M/s 2MiB 20.4M/s 1MiB 20.1M/s 512KiB 19.7M/s 256KiB 18.6M/s 128KiB 17M/s 64KiB 18M/s 32KiB 12.5M/s 16KiB 8.61M/s 8KiB 4.42M/s 4KiB 2.01M/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=3 4MiB 20.5M/s 2MiB 20M/s 1MiB 20.2M/s 512KiB 19.6M/s 256KiB 18.6M/s 128KiB 16.9M/s 64KiB 18M/s 32KiB 12.4M/s 16KiB 8.5M/s 8KiB 3.97M/s 4KiB 1.98M/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=4 4MiB 20.5M/s 2MiB 20.3M/s 1MiB 20M/s 512KiB 19.6M/s 256KiB 18.5M/s 128KiB 16.9M/s 64KiB 18M/s 32KiB 12.3M/s 16KiB 8.54M/s 8KiB 4.38M/s 4KiB 1.97M/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=5 4MiB 20.5M/s 2MiB 20.2M/s 1MiB 20M/s 512KiB 19.6M/s 256KiB 18.5M/s 128KiB 16.9M/s 64KiB 18M/s 32KiB 12.4M/s 16KiB 8.52M/s 8KiB 4.11M/s 4KiB 1.96M/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=6 4MiB 20.6M/s 2MiB 20.3M/s 1MiB 20.1M/s 512KiB 19.6M/s 256KiB 18.6M/s 128KiB 16.9M/s 64KiB 17.9M/s 32KiB 12.3M/s 16KiB 8.48M/s 8KiB 4.13M/s 4KiB 2.04M/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=7 4MiB 20.3M/s 2MiB 11.5M/s 1MiB 4.41M/s 512KiB 2.06M/s 256KiB 9.22M/s 128KiB 16.9M/s 64KiB 18.1M/s 32KiB 12.3M/s 16KiB 8.48M/s 8KiB 4.16M/s 4KiB 1.95M/s ./flashbench /dev/sdc --open-au --erasesize=4194304 --blocksize=4096 --open-au-nr=8 4MiB 20.4M/s 2MiB 11.7M/s 1MiB 4.4M/s 512KiB 2.06M/s 256KiB 1.01M/s 128KiB 499K/s 64KiB 249K/s 32KiB 125K/s 16KiB 973K/s 8KiB 453K/s 4KiB 411K/s
./flashbench /dev/sdc -f --erasesize=4194304 4MiB 19.7M/s 18.9M/s 20.3M/s 20.4M/s 20M/s 20.3M/s 2MiB 20.5M/s 18.9M/s 19.8M/s 20.6M/s 20.2M/s 20.6M/s 1MiB 20.4M/s 19M/s 20.1M/s 20.2M/s 20.5M/s 20.2M/s 512KiB 20.3M/s 19.2M/s 19.8M/s 20.2M/s 20.2M/s 20.2M/s 256KiB 19.9M/s 18.9M/s 19.4M/s 19.8M/s 19.6M/s 19.6M/s 128KiB 19M/s 17.9M/s 18.7M/s 18.9M/s 19.1M/s 18.8M/s 64KiB 18.9M/s 17.9M/s 18.2M/s 18.9M/s 18.9M/s 18.9M/s 32KiB 16.7M/s 15.9M/s 16.5M/s 16.6M/s 16.5M/s 16.5M/s 16KiB 13.8M/s 13.1M/s 13.9M/s 13.6M/s 13.7M/s 13.6M/s