SDInfo will display information about an SD card. It is non-destructive (i.e. data is safe).
$ sdinfo.py mmcblk0
This is very much a work in progress and should be considered incomplete. It is made available in the hope that others may find it useful.
Written on Arch Linux.
The latest version is available at ...
MIT License. See LICENSE file.
The 'research' directory contains scripts and information collected in the course of writing SDInfo.
FlashBench is a benchmarking tool for sd cards. Obtain from origin. It is also in the Arch Linux AUR.
For details refer to its README.
run_test.sh is a wrapper for flashbench, located in the research directory.
This result is for a card that I have, I don't know wnat to make of this output. Nothing drastic seems to happen until we hit the 8K boundary.
# flashbench -a /dev/mmcblk0 --blocksize=1024
align 2147483648 pre 1.61ms on 2.23ms post 1.98ms diff 433µs
align 1073741824 pre 1.31ms on 1.68ms post 1.51ms diff 274µs
align 536870912 pre 1.42ms on 1.87ms post 1.73ms diff 291µs
align 268435456 pre 1.5ms on 1.98ms post 1.74ms diff 358µs
align 134217728 pre 1.53ms on 2.09ms post 1.93ms diff 360µs
align 67108864 pre 1.42ms on 1.88ms post 1.7ms diff 315µs
align 33554432 pre 1.62ms on 2.49ms post 2.24ms diff 565µs
align 16777216 pre 1.82ms on 2.47ms post 2.27ms diff 428µs
align 8388608 pre 1.68ms on 2.62ms post 2.38ms diff 584µs
align 4194304 pre 1.88ms on 2.61ms post 2.34ms diff 500µs
align 2097152 pre 1.79ms on 2.39ms post 2.24ms diff 372µs
align 1048576 pre 1.78ms on 2.5ms post 2.11ms diff 558µs
align 524288 pre 1.83ms on 2.46ms post 2.23ms diff 432µs
align 262144 pre 1.75ms on 2.47ms post 2.25ms diff 471µs
align 131072 pre 1.79ms on 2.35ms post 2.25ms diff 330µs
align 65536 pre 1.78ms on 2.53ms post 2.24ms diff 520µs
align 32768 pre 1.75ms on 2.43ms post 2.15ms diff 478µs
align 16384 pre 1.77ms on 2.37ms post 2.18ms diff 399µs
align 8192 pre 2.06ms on 1.95ms post 2.02ms diff -90026n
align 4096 pre 2.17ms on 2.19ms post 2.11ms diff 51.3µs
align 2048 pre 2.15ms on 2.26ms post 2.19ms diff 83.9µs
# ./run_test.sh /dev/mmcblk0
Making sure the device has no mounted partitions
name 00000
oemid 0x534d
manfid 0x00001b
hwrev 0x1
fwrev 0x0
Running flashbench
4MiB 3.34M/s
2MiB 3.55M/s
1MiB 1.84M/s
512KiB 868K/s
256KiB 429K/s
128KiB 212K/s
64KiB 106K/s
32KiB 53.1K/s
16KiB 26.7K/s
8KiB 26.5K/s
4KiB 25.9K/s
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