I have an SSD that has Ubuntu installed, and a data HDD which used to be sdb. The hard drive has lots of data in it already. Now, I see fdisk doesn't show all partitions correctly and something has been changed. Below is the output from fdisk. First, the HDD is now shown as sda, but without partition (e.g. sda1). So I can't mount it.
$ sudo fdisk -l
Disk /dev/sda: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: B50CD632-617E-47EA-A984-B0A6096801E3
Device Start End Sectors Size Type
/dev/sdb1 2048 1050623 1048576 512M EFI System
/dev/sdb2 1050624 1819488255 1818437632 867.1G Linux filesystem
/dev/sdb3 1819488256 1953523711 134035456 63.9G Linux swap
When I check /etc/fstab, it shows
$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda2 during installation
UUID=65266004-ca77-48bc-97ce-28baa4002799 / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda1 during installation
UUID=50B9-B0CF /boot/efi vfat umask=0077 0 1
# swap was on /dev/sda3 during installation
UUID=ea9208b6-a4b1-4540-95ab-68fa7fe4d6bb none swap sw 0 0
What can I do to recover access to my HDD (/dev/sda above, but mysteriously it used to be sdb1)?
(Edit: below is the result from parted --list)
$ sudo parted --list
Model: ATA TOSHIBA HDWE140 (scsi)
Disk /dev/sda: 4001GB
Sector size (logical/physical): 512B/4096B
Partition Table: loop
Disk Flags:
Number Start End Size File system Flags
1 0.00B 4001GB 4001GB ext4
Model: ATA Samsung SSD 850 (scsi)
Disk /dev/sdb: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 538MB 537MB fat32 EFI System Partition boot, esp
2 538MB 932GB 931GB ext4
3 932GB 1000GB 68.6GB linux-swap(v1)
