Hi Guys
I *think* this card is not that bad.
********************************************** **** Lexar mobile microSDHC class 6, 8 GB **** **********************************************
==> /sys/block/mmcblk0/device/cid <== 0941502020202020102180020900b400
==> /sys/block/mmcblk0/device/csd <== 400e00325b5900003bad7f800a400000
==> /sys/block/mmcblk0/device/scr <== 0235800000000000
==> /sys/block/mmcblk0/device/fwrev <== 0x0
==> /sys/block/mmcblk0/device/hwrev <== 0x1
==> /sys/block/mmcblk0/device/cid <== 0941502020202020102180020900b400
==> /sys/block/mmcblk0/device/manfid <== 0x000009
==> /sys/block/mmcblk0/device/oemid <== 0x4150
==> /sys/block/mmcblk0/device/serial <== 0x21800209
==> /sys/block/mmcblk0/device/erase_size <== 512
==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304
==> /sys/block/mmcblk0/device/name <==
==> /sys/block/mmcblk0/device/date <== 04/2011 clock: 33000000 Hz vdd: 20 (3.2 ~ 3.3 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 2 (4 bits) timing spec: 2 (sd high-speed)
./flashbench -a /dev/sda3 --count=100 --blocksize=2048 align 134217728 pre 744µs on 982µs post 863µs diff 178µs align 67108864 pre 744µs on 981µs post 861µs diff 178µs align 33554432 pre 743µs on 967µs post 862µs diff 165µs align 16777216 pre 742µs on 970µs post 866µs diff 166µs align 8388608 pre 744µs on 974µs post 862µs diff 171µs align 4194304 pre 746µs on 961µs post 865µs diff 156µs align 2097152 pre 744µs on 855µs post 863µs diff 51.3µs align 1048576 pre 744µs on 854µs post 867µs diff 48.1µs align 524288 pre 743µs on 855µs post 868µs diff 50.1µs align 262144 pre 744µs on 855µs post 867µs diff 49.6µs align 131072 pre 744µs on 862µs post 865µs diff 57.1µs align 65536 pre 745µs on 867µs post 860µs diff 64.9µs align 32768 pre 744µs on 870µs post 867µs diff 64.3µs align 16384 pre 743µs on 868µs post 863µs diff 64.5µs align 8192 pre 742µs on 868µs post 864µs diff 64.8µs align 4096 pre 744µs on 865µs post 867µs diff 59.3µs
-> 4MiB erase block
./flashbench /dev/sda3 --open-au-nr=5 -O --blocksize=2048 4MiB 8.69M/s 2MiB 5.31M/s 1MiB 11M/s 512KiB 11M/s 256KiB 10.8M/s 128KiB 10.5M/s 64KiB 10.4M/s 32KiB 9.19M/s 16KiB 7.25M/s 8KiB 4.43M/s 4KiB 2.26M/s 2KiB 1.16M/s
./flashbench /dev/sda3 --open-au-nr=6 -O --blocksize=2048 4MiB 8.78M/s 2MiB 3.95M/s 1MiB 1.71M/s 512KiB 969K/s 256KiB 487K/s
-> deals well with 5 blocks
./flashbench /dev/sda3 --open-au-nr=5 -O --blocksize=2048 --random 4MiB 8.09M/s 2MiB 8.24M/s 1MiB 10.1M/s 512KiB 9.9M/s 256KiB 9.34M/s 128KiB 8.49M/s 64KiB 9.02M/s 32KiB 7.27M/s 16KiB 5.2M/s 8KiB 3.02M/s 4KiB 1.19M/s 2KiB 582K/s
./flashbench /dev/sda3 --open-au-nr=5 -O --blocksize=2048 --random 4MiB 10.2M/s 2MiB 9.95M/s 1MiB 10.1M/s 512KiB 9.89M/s 256KiB 9.7M/s 128KiB 9.3M/s 64KiB 9.07M/s 32KiB 7.31M/s 16KiB 5.21M/s 8KiB 3.02M/s 4KiB 1.2M/s 2KiB 584K/s
-> looks quite fair enough also on random access
./flashbench /dev/sda3 --open-au-nr=5 -O --blocksize=2048 --random --offset=$[123 * 512] 4MiB 4.49M/s 2MiB 2.28M/s 1MiB 2.27M/s 512KiB 2.23M/s 256KiB 2.19M/s 128KiB 2.13M/s 64KiB 2.1M/s 32KiB 1.34M/s 16KiB 756K/s 8KiB 398K/s 4KiB 206K/s
-> unaligned quite slow
peter