NOOBS起動後電源断したSDカードの様子です。ブートフラグ消されてるんですけどw
$ sudo sfdisk --list /dev/sdb
Disk /dev/sdb: 59.5 GiB, 63864569856 bytes, 124735488 sectors
Disk model: Card Reader
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: 0x000b6901
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 3187500 3185453 1.5G e W95 FAT16 (LBA)
/dev/sdb2 3187501 124735487 121547987 58G 5 Extended
/dev/sdb5 3194880 3260413 65534 32M 83 Linux