Single-disk Synology with bad sectors

A question of how – Mount, Find & Recover DATA in HDD outside of Synology Box

[With] a Synology … run into issues or Hard Drive corruption/ error in sectors etc. where I have had to pretty much remove the Drive which Synology refuses to read or work with. The question is, assuming I am able to detect the Hard Drive and assuming that hardware is still kind of functional, what way can I LOAD/ MOUNT the Drive (under Windows or Linux OS etc) on a PC/Laptop? (What tools/ software should I used to do that?)

Home NAS Recovery will work for you. Syngle-disk Synology is pretty standard setup. I have to recommend a PC, not a laptop. When the drive is suspected to have bad blocks, the common wisdom is that USB is to be avoided, and laptops are mostly limited to USB.

I’ve used several Partition Management tools and I can see 4 partitions inside the Disk as created by Synology.

That’s normal, and does not provide any significant additional information.

[various ext4 reading programs] none of which have been able to recover data (geeksnerds, stellar phoenix, linux reader, explore2fs, ext2explore, none of which allowed me to copy, recover or even see data files).

That depends on how bad the disk is damaged. Also some of these programs may be not quite compatible, especially if we are talking about modern Synology with EXT4. While EXT3 is identical to EXT2 in all respects concerning read-only driver, EXT4 is different.

[also] a Linux / RAID based solution that worked for someone, but not for me.

If Synology with its own, specifically adapted Linux, refused the disk, then most likely any stock Linux distro will also refuse the disk.


SHR on two identical disks

The set of questions from here, while SHR-specific, applies to NETGEARs X-RAID as well.

I have a DS213j set up as Synology Hybrid RAID (SHR) with 2 2TB disks. What happens if the DS213j fails? Are the disks just mirrors so that I can connect either to a PC and see it as an external drive and recover the data? If not would it be better to change to RAID 1? What are the advantages of SHR over RAID 1?

SHR means Synology Hybrid RAID. The advantage of SHR is that SHR can better utilize capacity of mixed size disks, and SHR supports some weird disk upgrades which are normally done by deleting and rebuilding the traditional array.

However, if we are talking two identical disks and no plans to upgrade, SHR is in effect the same as RAID1, so there is really no choosing one or the other.

Basic Synology case

This is the simplest possible example of recovery, the unit being unidentified Synology.

Hard drive in my synology nas crashed yesterday. The disk was installed as a basic disc without protection. … storage manager … showed the disk as “not initialized”. I took out the disk and connected it to my windows computer to try recovering the files. I used “Ext2 volume manager” to see the hdd and it shows me 3 partitions … EXT3, SWAP and RAW. On the EXT3 there are some files but not the one I had saved on the hard drive.

How do I find the files that I had saved on the hdd?

And how do I know that my hard drive really is broken? The synology storage manager is not able to finish S.M.A.R.T Test.

As I do fairly often, I will address the last question first. If the SMART test cannot be completed, the drive is broken.

As far as partitions go, first one is most often firmware. SWAP is just what it says on the tin, and RAW is either data (which is probably maintained by md-raid so it was not recognized) or something broken. In any case, the first EXT3 partition is useless for recovery; you will get back some Linux binaries, not your data. On a bright side, Home NAS Recovery can see through the md-raid structures, identifies the partitions on its own, and reads EXT quite well.

Synology SHR

Recovery of a crashed volume on a Synology (here), can be complicated if SHR is involved,

I have a DS1010+ with all five drives composing a single SHR (Synology Hybrid Raid) volume.

I had a fan go bad … which seems to have corrupted the volume. Currently the volume reads as “Crashed” and two of the five drives read as “System Partition Failure”. … S.M.A.R.T. Test … resulted in “Normal” readings.

… has anyone has had success recovering data from a crashed volume that used SHR vs. a more universal RAID format. Or could anyone suggest a data recovery process or software that might work with SHR.

As far as the disks are installed all at the same time, and all the disks are identical, Synology Hybrid RAID is the same as normal RAID5. If one more disk of the same size is added, the array is expanded but still conforms to a RAID5 spec. If the disks are replaced with larger ones to expand capacity, the SHR capabilities come into play and the array does not conform to a RAID5 spec any longer.

One way to deal with that is to call Synology support and have them try and fix the issue. The other option is to use our Home NAS Recovery, but it will only work with SHR if all disks are of the same size and all were installed at the same time.