Hello there!
I tested a few flashdrives over the past few months. I'm glad to share the
results.
PN: SDCZ50-016G
SN: BL150825xxxx probabably manufactured at '15, 8th week.
Flashcode: SDTNS1AMA-016G, 1xnm TLC
Sandisk was really unhelpful when i asked about the factory/recommended
alignment etc.
fdisk -l /dev/sdb
Disk /dev/sdb: 14,6 GiB, 15631122432 bytes, 30529536 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
Disklabel type: dos
Disk identifier: 0x00000000
Eszköz Indítható Start Vége Szektorok Size Id Típus
/dev/sdb1 32 30529535 30529504 14,6G c W95 FAT32 (LBA)
benchflash -a -b 1024 /dev/sdb
align 4294967296 pre 940µs on 1.2ms post 987µs diff 238µs
align 2147483648 pre 891µs on 1.16ms post 915µs diff 252µs
align 1073741824 pre 968µs on 1.23ms post 986µs diff 256µs
align 536870912 pre 986µs on 1.23ms post 990µs diff 239µs
align 268435456 pre 986µs on 1.24ms post 987µs diff 257µs
align 134217728 pre 967µs on 1.23ms post 973µs diff 260µs
align 67108864 pre 970µs on 1.24ms post 952µs diff 281µs
align 33554432 pre 956µs on 1.24ms post 986µs diff 269µs
align 16777216 pre 914µs on 1.21ms post 911µs diff 296µs
align 8388608 pre 964µs on 1.23ms post 980µs diff 256µs
align 4194304 pre 965µs on 1.2ms post 957µs diff 239µs
align 2097152 pre 968µs on 1.1ms post 980µs diff 128µs
align 1048576 pre 958µs on 1.09ms post 972µs diff 124µs
align 524288 pre 958µs on 1.09ms post 968µs diff 129µs
align 262144 pre 960µs on 1.1ms post 970µs diff 140µs
align 131072 pre 973µs on 1.09ms post 935µs diff 134µs
align 65536 pre 968µs on 1.11ms post 958µs diff 147µs
align 32768 pre 960µs on 1.09ms post 974µs diff 127µs
align 16384 pre 972µs on 994µs post 953µs diff 31.6µs
align 8192 pre 966µs on 991µs post 972µs diff 22.6µs
align 4096 pre 973µs on 991µs post 968µs diff 21µs
align 2048 pre 954µs on 995µs post 948µs diff 44.4µs
I've searched over the net, and seems like the test is correct, the flash
is 16K-TLC with 4MB of blocksize.
Balazs
