APACER SD Embedded(SLC) 4GB:
./flashbench -a /dev/sdd2 align 67108864 pre 1.97ms on 1.96ms post 1.61ms diff 164µs align 33554432 pre 1.95ms on 1.95ms post 1.63ms diff 163µs align 16777216 pre 1.95ms on 1.94ms post 1.63ms diff 147µs align 8388608 pre 1.96ms on 1.96ms post 1.63ms diff 164µs align 4194304 pre 1.94ms on 1.94ms post 1.63ms diff 161µs align 2097152 pre 1.95ms on 1.94ms post 1.63ms diff 149µs align 1048576 pre 1.93ms on 1.94ms post 1.63ms diff 157µs align 524288 pre 1.62ms on 1.63ms post 1.62ms diff 2.07µs align 262144 pre 1.62ms on 1.63ms post 1.63ms diff 398ns align 131072 pre 1.62ms on 1.63ms post 1.63ms diff -620ns align 65536 pre 1.63ms on 1.63ms post 1.63ms diff 530ns align 32768 pre 1.62ms on 1.63ms post 1.63ms diff 2.37µs
./flashbench --open-au --open-au-nr=1 /dev/sdd2 4MiB 11.1M/s 2MiB 8.64M/s 1MiB 10M/s 512KiB 11.4M/s 256KiB 11.4M/s 128KiB 11.1M/s 64KiB 17.8M/s 32KiB 9.01M/s 16KiB 5.99M/s ./flashbench --open-au --open-au-nr=2 /dev/sdd2 4MiB 6.78M/s 2MiB 4.58M/s 1MiB 2.62M/s 512KiB 4.78M/s 256KiB 7M/s 128KiB 9.18M/s 64KiB 9.69M/s 32KiB 7.76M/s 16KiB 4.97M/s ./flashbench --open-au --open-au-nr=3 /dev/sdd2 4MiB 5.53M/s 2MiB 4.04M/s 1MiB 2.62M/s 512KiB 5.04M/s 256KiB 7.41M/s 128KiB 7.15M/s 64KiB 7.26M/s 32KiB 5.21M/s 16KiB 3.04M/s
head /sys/block/sdd/device/* ==> /sys/block/sdd/device/block <== head: error reading `/sys/block/sdd/device/block': Is a directory
==> /sys/block/sdd/device/bsg <== head: error reading `/sys/block/sdd/device/bsg': Is a directory head: cannot open `/sys/block/sdd/device/delete' for reading: Permission denied
==> /sys/block/sdd/device/device_blocked <== 0
==> /sys/block/sdd/device/dh_state <== detached
==> /sys/block/sdd/device/driver <== head: error reading `/sys/block/sdd/device/driver': Is a directory
==> /sys/block/sdd/device/evt_media_change <== 0
==> /sys/block/sdd/device/generic <== head: error reading `/sys/block/sdd/device/generic': Is a directory
==> /sys/block/sdd/device/iocounterbits <== 32
==> /sys/block/sdd/device/iodone_cnt <== 0x243f01
==> /sys/block/sdd/device/ioerr_cnt <== 0x218ba6
==> /sys/block/sdd/device/iorequest_cnt <== 0x243f01
==> /sys/block/sdd/device/max_sectors <== 240
==> /sys/block/sdd/device/modalias <== scsi:t-0x00
==> /sys/block/sdd/device/model <== STORAGE DEVICE
==> /sys/block/sdd/device/power <== head: error reading `/sys/block/sdd/device/power': Is a directory
==> /sys/block/sdd/device/queue_depth <== 1
==> /sys/block/sdd/device/queue_type <== none head: cannot open `/sys/block/sdd/device/rescan' for reading: Permission denied
==> /sys/block/sdd/device/rev <== 9744
==> /sys/block/sdd/device/scsi_device <== head: error reading `/sys/block/sdd/device/scsi_device': Is a directory
==> /sys/block/sdd/device/scsi_disk <== head: error reading `/sys/block/sdd/device/scsi_disk': Is a directory
==> /sys/block/sdd/device/scsi_generic <== head: error reading `/sys/block/sdd/device/scsi_generic': Is a directory
==> /sys/block/sdd/device/scsi_level <== 0
==> /sys/block/sdd/device/state <== running
==> /sys/block/sdd/device/subsystem <== head: error reading `/sys/block/sdd/device/subsystem': Is a directory
==> /sys/block/sdd/device/timeout <== 30
==> /sys/block/sdd/device/type <== 0
==> /sys/block/sdd/device/uevent <== DEVTYPE=scsi_device DRIVER=sd MODALIAS=scsi:t-0x00
==> /sys/block/sdd/device/vendor <== Generic