I have some old disks on the shelf and trying to get them organized.

 

Some of the disks mount, and some do not.

 

The ones that mount seem to have the partition aligned on sector 63, for example:

   Device Boot      Start         End      Blocks   Id  System
/dev/sdm1              63  1465149167   732574552+  83  Linux

 

The ones that don't want to mount are aligned on sector 64, for example:

   Device Boot      Start         End      Blocks   Id  System
/dev/sdn1              64  2930277167  1465138552   83  Linux

Trying to mount with this command:

 

mount -o noatime,nodiratime /dev/disk/by-id/ata-ST31500541AS_5XW05xxx-part1 /mnt/myMountPoint

 

I get the error:

mount: block device /dev/sdn1 is write-protected, mounting read-only
mount: you must specify the filesystem type

Adding the file system type of "-t reiserfs" doesn't help:

 

mount: wrong fs type, bad option, bad superblock on /dev/sdn1,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so
 

This shows up in the syslog

Mar 6 21:35:29 Shark kernel: REISERFS warning (device sdn1): sh-2021 reiserfs_fill_super: can not find reiserfs on sdn1

 

I cat the device and I see signs of the files that I expect to be on the disk.

 

Any hints to how to mount this disk with unRAID v6? I expect the disk was formatted in the unRAID 4.x timeframe.

 

Thanks!

Starting sector by itself should make no difference for a successful mounting, did you try mounting with unRAID on a test server or the UD plugin, is the error the same?

 

If yes, I can only think of 2 options:

 

1) There's file system corruption

2) Somehow the starting sector was changed from the original 63 to 64

 

If it's option 2, and assuming the disks are 2TB or smaller and are partitioned using MBR you can try mounting after changing the starting sector to 63 with sfdisk:

 

(Although I did this before without any issues, and if it doesn't work changing the sector back to what it was should not cause any problems with the data, use at your own risk)

 

sfdisk /dev/sdX

 

Then type this in order always followed by pressing enter at the end of each line:

 

63
write

Data won't be touched, only the starting sector, if it still doesn't mount change back to 64 and run reiserfsck.