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GRUB loading...
Wlecome to GRUB!
error: ../../grub-core/kern/disk.c:258: no such partition.
error: ../../grub-core/kern/disk.c:258: no such partition.
Entering rescue mode...

sudo fdisk -l -u /dev/sda
Disk /dev/sda: 1.86 TiB, 2048408248320 bytes, 4000797360 sectors
Disk model: Fanxiang S101Q 2
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: 0xc90df846

Device     Boot Start        End    Sectors  Size Id Type
/dev/sda1        2048 4000794623 4000792576  1.9T  6 FAT16
=====================================================
user@debian:~$ sudo fsck /dev/sda
fsck from util-linux 2.38.1
e2fsck 1.47.0 (5-Feb-2023)
ext2fs_open2: Bad magic number in super-block
fsck.ext2: Superblock invalid, trying backup blocks...
fsck.ext2: Bad magic number in super-block while trying to open /dev/sda

The superblock could not be read or does not describe a valid ext2/ext3/ext4
filesystem.  If the device is valid and it really contains an ext2/ext3/ext4
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>
 or
    e2fsck -b 32768 <device>

Found a dos partition table in /dev/sda
user@debian:~$ e2fsck -b 8193 /dev/sda
bash: e2fsck: command not found
user@debian:~$ sudo e2fsck -b 8193 /dev/sda
e2fsck 1.47.0 (5-Feb-2023)
e2fsck: Bad magic number in super-block while trying to open /dev/sda

The superblock could not be read or does not describe a valid ext2/ext3/ext4
filesystem.  If the device is valid and it really contains an ext2/ext3/ext4
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>
 or
    e2fsck -b 32768 <device>

Found a dos partition table in /dev/sda