I have an SSD which holds / and my home directory, but I also have a 1TB HDD with most of my music on. I tried to edit /etc/fstab to automatically mount the HDD to save me time. I am running Kubuntu.I opened KDE Partition Manager to check the type of the filesystem and it read ext3The line I added read:/dev/sda /media/HDD ext3 defaults 0 2On rebooting, an error appeared under 'Kubuntu' on the boot screen saying that the filesystem couldn't mount so I hit S to skip attempting to mount.Running sudo blkid shows:/dev/sda1: LABEL=HDD UUID=00000000-dba3-409e-a185-345c60459125 TYPE=ext2 /dev/sdb1: UUID=44cdc69c-0746-4a99-9c48-ccf7fca69768 TYPE=ext4 /dev/sdb5: UUID=478bf04c-8bf6-46c4-86e8-e844380cf8e7 TYPE=swap I can remember when I created the partition originally, I didn't set it to ext2 (even though this was ~2 years ago)I attempted a couple more times with different options (changing defaults to other commands rw,async,auto...). The HDD will no longer mount. When opening in dolphin, the message reads:An error occurred while accessing 'Home', the system responded: The requested operation has failed: Error mounting /dev/sda1 at /media/myname/HDD: Command-line `mount -t ext2 -o uhelper=udisks2,nodev,nosuid /dev/sda1 /media/myname/HDD' exited with non-zero exit status 32: mount: wrong fs type, bad option, bad superblock on /dev/sda1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so KDE Partition Manager says the type is unknown. Clicking 'properties' shows it as unformattedfdisk -l gives the following:    Disk /dev/sda: 1000.2 GB, 1000204886016 bytes    255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors    Units = sectors of 1 * 512 = 512 bytes    Sector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk identifier: 0x000819aeDevice Boot      Start         End      Blocks   Id  System/dev/sda1              63  1953520064   976760001   83  LinuxPartition 1 does not start on physical sector boundary.Disk /dev/sdb: 128.0 GB, 128035676160 bytes255 heads, 63 sectors/track, 15566 cylinders, total 250069680 sectorsUnits = sectors of 1 * 512 = 512 bytes                    Sector size (logical/physical): 512 bytes / 512 bytes     I/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x0001a3c6                                    Device Boot      Start         End      Blocks   Id  System/dev/sdb1   *        2048   233330687   116664320   83  Linux/dev/sdb2       233332734   250068991     8368129    5  Extended/dev/sdb5       233332736   250068991     8368128   82  Linux swap / SolarisAttempting to mount gives the error~ $ sudo mount /dev/sda /media/HDD[sudo] password for myname: mount: wrong fs type, bad option, bad superblock on /dev/sda,   missing codepage or helper program, or other error   In some cases useful info is found in syslog - try   dmesg | tail  or sodmesg | tail says:[ 5632.049404] EXT2-fs (sda): error: ext2_check_descriptors: Block bitmap for group 880 not in group (block 0)![ 5632.049411] EXT2-fs (sda): group descriptors corrupted[ 5669.867629] EXT2-fs (sda): error: ext2_check_descriptors: Block bitmap for group 880 not in group (block 0)![ 5669.867632] EXT2-fs (sda): group descriptors corrupted[ 6894.395961] EXT2-fs (sda1): error: can't find an ext2 filesystem on dev sda1.[ 7040.625599] EXT3-fs (sda1): error: fragsize 1024 != blocksize 4096 (unsupported)[ 7045.462213] EXT2-fs (sda1): error: can't find an ext2 filesystem on dev sda1.[ 7048.975278] EXT4-fs (sda1): VFS: Can't find ext4 filesystem[ 7421.551590] EXT2-fs (sda1): error: can't find an ext2 filesystem on dev sda1.[ 7451.874417] EXT2-fs (sda1): error: can't find an ext2 filesystem on dev sda1.strace:$ strace -s 2000 -o mount.log blkid/dev/sda1: LABEL=HDD UUID=00000000-dba3-409e-a185-345c60459125 TYPE=ext2 /dev/sdb1: UUID=44cdc69c-0746-4a99-9c48-ccf7fca69768 TYPE=ext4 /dev/sdb5: UUID=478bf04c-8bf6-46c4-86e8-e844380cf8e7 TYPE=swap /proc/filesystems:$ cat /proc/filesystemsnodev   sysfsnodev   rootfsnodev   bdevnodev   procnodev   cgroupnodev   cpusetnodev   tmpfsnodev   devtmpfsnodev   debugfsnodev   securityfsnodev   sockfsnodev   pipefsnodev   anon_inodefsnodev   devpts        ext3        ext4nodev   ramfsnodev   hugetlbfs        vfatnodev   ecryptfs        fuseblknodev   fusenodev   fusectlnodev   pstorenodev   mqueuenodev   binfmt_misc        ext2        udf
HDD no longer able to mount after editing /etc/fstab
filesystems;mount