Label on packaging:
Class 6 Read: Max 24MB/s Write: Max 13 MB/s
Label on Card:
front (blue): 8 GB
back: CE MMBTR08GUBCA-ME I CYG498GA 135 Made in TAIWAN
head /sys/block/mmcblk0/device/* ==> /sys/block/mmcblk0/device/cid <== 1b534d30303030301001952e5c00b900 ==> /sys/block/mmcblk0/device/csd <== 400e00325b5900003b577f800a400000 ==> /sys/block/mmcblk0/device/date <== 09/2011 ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x1 ==> /sys/block/mmcblk0/device/manfid <== 0x00001b ==> /sys/block/mmcblk0/device/name <== 00000 ==> /sys/block/mmcblk0/device/oemid <== 0x534d ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235800000000000 ==> /sys/block/mmcblk0/device/serial <== 0x01952e5c ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=00000 MODALIAS=mmc:block
$ sudo fdisk -lu /dev/mmcblk0
Disk /dev/mmcblk0: 7964 MB, 7964983296 bytes 91 heads, 18 sectors/track, 9497 cylinders, total 15556608 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/mmcblk0p1 8192 15556607 7774208 b W95 FAT32
$ factor 15556608 15556608: 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 211
$ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024align 805306368 pre 817µs on 1.17ms post 784µs diff 373µs align 536870912 pre 940µs on 1.24ms post 851µs diff 344µs align 402653184 pre 835µs on 1.18ms post 797µs diff 363µs align 268435456 pre 968µs on 1.23ms post 868µs diff 313µs align 201326592 pre 833µs on 1.18ms post 780µs diff 371µs align 134217728 pre 949µs on 1.24ms post 846µs diff 341µs align 100663296 pre 820µs on 1.17ms post 784µs diff 371µs align 67108864 pre 967µs on 1.27ms post 876µs diff 345µs align 50331648 pre 834µs on 1.18ms post 778µs diff 373µs align 33554432 pre 975µs on 1.24ms post 850µs diff 327µs align 25165824 pre 839µs on 1.17ms post 782µs diff 362µs align 16777216 pre 980µs on 1.27ms post 879µs diff 336µs align 12582912 pre 812µs on 1.14ms post 781µs diff 348µs align 8388608 pre 939µs on 1.22ms post 849µs diff 322µs align 6291456 pre 749µs on 1.13ms post 809µs diff 347µs align 4194304 pre 806µs on 1.06ms post 819µs diff 248µs align 3145728 pre 696µs on 790µs post 783µs diff 50µs align 2097152 pre 800µs on 1.04ms post 800µs diff 242µs align 1572864 pre 693µs on 790µs post 792µs diff 48.4µs align 1048576 pre 690µs on 803µs post 805µs diff 55.4µs align 786432 pre 723µs on 821µs post 816µs diff 51.8µs align 524288 pre 688µs on 790µs post 801µs diff 45.1µs align 393216 pre 699µs on 796µs post 792µs diff 50.1µs align 262144 pre 696µs on 807µs post 807µs diff 55.7µs align 196608 pre 725µs on 822µs post 823µs diff 48.3µs align 131072 pre 693µs on 794µs post 802µs diff 46.7µs align 98304 pre 716µs on 820µs post 825µs diff 49.2µs align 65536 pre 684µs on 790µs post 796µs diff 50.3µs align 49152 pre 717µs on 813µs post 821µs diff 43.7µs align 32768 pre 703µs on 806µs post 800µs diff 54.1µs align 24576 pre 717µs on 810µs post 822µs diff 40.7µs align 16384 pre 708µs on 801µs post 812µs diff 40.2µs align 12288 pre 762µs on 756µs post 754µs diff -2647ns align 8192 pre 718µs on 805µs post 821µs diff 36.1µs align 6144 pre 737µs on 729µs post 721µs diff 535ns align 4096 pre 777µs on 769µs post 761µs diff -199ns align 3072 pre 774µs on 775µs post 753µs diff 10.8µs align 2048 pre 788µs on 783µs post 773µs diff 2.25µs
$ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] --open-au-nr=2 6MiB 7.73M/s 3MiB 6.04M/s 1.5MiB 7.7M/s 768KiB 7.68M/s 384KiB 7.68M/s 192KiB 7.67M/s 96KiB 6.56M/s 48KiB 6.05M/s 24KiB 4.04M/s
$ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] --open-au-nr=3 6MiB 7.69M/s 3MiB 5.08M/s 1.5MiB 2.92M/s 768KiB 2.25M/s 384KiB 1.54M/s 192KiB 1.48M/s 96KiB 1.09M/s 48KiB 1.1M/s 24KiB 1.08M/s
$ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] --open-au-nr=1 --random 6MiB 3.16M/s 3MiB 1.77M/s 1.5MiB 1.4M/s 768KiB 583K/s 384KiB 331K/s 192KiB 166K/s