My both hard drives where all my data is stored are failing. My system insconstently refuses to load the disks and mount the partitions. I moved one hard drive to other computer where it is recognized with less trouble but the partition has many errors, and I still get E/S errors on dmesg for that drive.
The partition for start has a bad superblock but it can be read with an alternative superblock where it shows even more errors so i did first a master backup of the partition on an external hard drive. I did two passes on ddrescue for this reason and it exited with only one error of 512 bytes acccording to the log, which I think is promising.
Listing the backup with lsblk looks even more promising:
Where lsblk for the damaged partition shows:
$lsblk -f NAME FSTYPE LABEL UUID MOUNTPOINT ... sda └─sda1 ...
Where the now master shows:
sdc ├─sdc1 ext4 new 8cab6f75-1ea7-4451-9f48-2bbcce167184
Now I did another backup from this master partition to the end of the same drive, so the actual output of lsblk would be:
lsblk -f NAME FSTYPE LABEL UUID MOUNTPOINT fd0 loop0 squashfs /snap/anbox-installer/25 loop2 squashfs /snap/core/9669 loop3 squashfs /snap/core/10911 sda └─sda1 sdb ├─sdb1 ext4 Debian_copia ce2c8e8f-f3ef-4005-9cb1-0bb9d5870f43 / └─sdb2 swap d60a8ad0-5528-4bbc-af5e-092b96282df4 [SWAP] sdc ├─sdc1 ext4 new 8cab6f75-1ea7-4451-9f48-2bbcce167184 └─sdc2 ext4 new 8cab6f75-1ea7-4451-9f48-2bbcce167184 sr0
Now here it is where is missed up things, I mistaken option p of fsck for option f so i have done
fsck -fy /dev/sdc2
which screwed it up some things and deleted some many nodes which after mounting it listed half of the files that should be, affortunately this is a copy of a copy of the damaged hard drive, so this time i will be more cautious.
Could you tell me please some good practices? my all data is in a gamble right now so please be precise.
Does lsblk make any changes to the partitions? can I mount a partition without doing any changes on it? I have this link handy btw: https://www.sans.org/blog/how-to-mount-dirty-ext4-file-systems/
How to safely do a fsck so i can win some time here? Does fsck -n still make changes to the partition? Does it make any difference where in the disk is a copy of a partition?
Is it any way of recovering the files without dealing with filesystem? I have read about photorec but i have many audacity file it would not recognize. Isnt it there anything more generic?