I have a dual-boot setup: Windows 10 + Ubuntu 20.04. I have 2 SSDs (both are Samsumg 860 EVO 1TB, in case it matters), but since I bought them at different times I made my partitions a bit weird:

SSD-1: (i believe there were also 2 or 3 tiny system reserved partitions, like Windows Recovery and EFI partition)

  1. (NTFS) Windows 10 C: partition (~260GB)
  2. (NTFS) Data partition (~670GB)


  1. (NTFS) Data partition (~850GB)
  2. (ext4) Linux root partition (~20GB)
  3. (ext4) Linux home partition (~55GB)

One day, I was using Ubuntu and I shut down my PC. Later that day, I booted just to be met with the UEFI BIOS setup screen, because it couldn't find any boot devices.

At first, I thought that I messed something up with the bootloaders so I inserted a Windows 10 installation disk and went into recovery mode. The built-in recovery tool proved to be useless (as it always does), so I started Command Prompt and found that drive C: is my SSD-2 data partition. It couldn't find the first SSD!

I decided to boot into a Linux live session, since it has more tools available. GParted showed me that /dev/sdb only had the NTFS partition (the 75GB of ext4 were unallocated space), while /dev/sda was corrupted entirely: about 40MB of unallocated space at the beginning and the rest of it was a single partition with an unknown filesystem.

I took SSD-1 out to another Windows computer and the Disk Management tool shows the same thing. I should mention it was a GPT disk, but I don't know if that helps (usually, if a PC cannot read GPT disks it reports it as a single unknown partition, but my PC is very much GPT-aware).

So my question is: What can I do? Can I recover my 2 SSDs? (especially that data partition)

UPDATE: I used AOMEI Partition Assistant to recover all partitions. Now I am able to boot into Linux, however Windows still gives me some weird error on a blue screen (it's not a BSoD, it doesn't have the sad face): A required device isn't connected or can't be accesed.

  • One question per post, please. Read the Help section if you have questions. – music2myear Sep 27 '20 at 21:59

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