I've got a Synology NAS DS213 that has RAID1 and 2 External Hard Disks attached via USB and a hard drive dock.
Everything is OKAY with the RAID1.
I'm having problems with one of the external hard disks attached via USB. It's a 2TB Seagate.
The Synology NAS doesn't recognize the drive anymore. I even tried accessing the Synology via SSH and did a df at the command line and the drive didn't show up.
So I started up testdisk and attached it to my MacBook.
Running testdisk, I see the directory structure and I am able to copy files. Thank god!
However, I'm not sure how I should go about repairing the drive. Is there something wrong with the partition? Do I need to run fsck.ext4 ?
I've never repaired a hard drive with EXT4. I have repaired hard drives formatted for Windows before and have had success.
I ran testdisk and one of the messages I got was this:
Warning: the current number of heads per cylinder is 1
but the correct value may be 64.
You can use the Geometry menu to change this value.
It's something to try if
- some partitions are not found by TestDisk
- or the partition table can not be written because partitions overlaps.
I'm not sure what the parameters are for a normal drive attached via USB. Should it be Primary or Extended or Logical ?
Worst case scenario I might just buy another hard drive and just copy all the data over...
How to use TestDisk to recover lost partition
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