Hello! Please look at the result of this card below. PN: MB-MC32G Factory alignment 8 MiB. 8K sector and probably 4MiB erase size, however it's TLC.

######## Fdisk Disk /dev/mmcblk1: 29.8 GiB, 32010928128 bytes, 62521344 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

Device Boot Start End Sectors Size Id Type /dev/mmcblk1p1 8192 62521343 62513152 29.8G c W95 FAT32 (LBA)

######## flashbench align 8589934592 pre 429µs on 553µs post 352µs diff 162µs align 4294967296 pre 425µs on 552µs post 354µs diff 163µs align 2147483648 pre 433µs on 552µs post 352µs diff 159µs align 1073741824 pre 432µs on 554µs post 353µs diff 162µs align 536870912 pre 429µs on 553µs post 353µs diff 162µs align 268435456 pre 433µs on 554µs post 353µs diff 160µs align 134217728 pre 433µs on 551µs post 354µs diff 158µs align 67108864 pre 435µs on 552µs post 354µs diff 158µs align 33554432 pre 436µs on 552µs post 353µs diff 158µs align 16777216 pre 413µs on 582µs post 383µs diff 184µs align 8388608 pre 420µs on 591µs post 366µs diff 198µs align 4194304 pre 415µs on 555µs post 353µs diff 171µs align 2097152 pre 405µs on 567µs post 387µs diff 170µs align 1048576 pre 412µs on 574µs post 411µs diff 162µs align 524288 pre 413µs on 566µs post 388µs diff 165µs align 262144 pre 415µs on 569µs post 413µs diff 154µs align 131072 pre 414µs on 561µs post 390µs diff 159µs align 65536 pre 408µs on 608µs post 371µs diff 218µs align 32768 pre 412µs on 590µs post 367µs diff 200µs align 16384 pre 430µs on 538µs post 355µs diff 145µs align 8192 pre 380µs on 379µs post 349µs diff 14.4µs align 4096 pre 380µs on 384µs post 348µs diff 19.9µs align 2048 pre 387µs on 385µs post 383µs diff 134ns

######## device parameters /sys/block/mmcblk1/device/cid:1b534d454231515430416653ef012311 /sys/block/mmcblk1/device/csd:400e00325b590000ee7f7f800a404055 /sys/block/mmcblk1/device/date:03/2018 /sys/block/mmcblk1/device/erase_size:512 /sys/block/mmcblk1/device/fwrev:0x0 /sys/block/mmcblk1/device/hwrev:0x3 /sys/block/mmcblk1/device/manfid:0x00001b /sys/block/mmcblk1/device/name:EB1QT /sys/block/mmcblk1/device/oemid:0x534d /sys/block/mmcblk1/device/preferred_erase_size:4194304 /sys/block/mmcblk1/device/scr:02b5800200000000 /sys/block/mmcblk1/device/type:SD /sys/block/mmcblk1/device/uevent:DRIVER=mmcblk /sys/block/mmcblk1/device/uevent:MMC_TYPE=SD /sys/block/mmcblk1/device/uevent:MMC_NAME=EB1QT /sys/block/mmcblk1/device/uevent:MODALIAS=mmc:block

Best regards