ducoterra
7d2e8b6b7b
All checks were successful
Podman DDNS Image / build-and-push-ddns (push) Successful in 58s
30 lines
729 B
Markdown
30 lines
729 B
Markdown
# Data Recovery
|
|
|
|
## Lost btrfs filesystem
|
|
|
|
1. BTRFS expects its header (`_BHRfS_M`) to be 64KiB offset from the start of the disk
|
|
|
|
```bash
|
|
# Find the byte position of _BHRfS_M
|
|
# Convert this to dec before using the number
|
|
hexdump -C borg.raw | less
|
|
|
|
# Create a loop device starting at that position
|
|
# Device will be created at /dev/loopX
|
|
# -f finds the first available number to use
|
|
# -P scans the partition table
|
|
# -b is sector size
|
|
# --offset 8388672 sets the offset if there are partitions ahead of the one you're after
|
|
# use the byte offset above
|
|
losetup -fP -b 4096 borg.raw
|
|
|
|
# List loop devices
|
|
losetup -l
|
|
|
|
# Mount the partition
|
|
mount /dev/loop0p1 /mnt/restore
|
|
|
|
# Delete the loop device when done
|
|
losetup -d /dev/loopX
|
|
```
|