1TB hårddisk visar endast 32 MB

Do you have a Gigabyte motherboard with Xpress Recovery BIOS?

If so, then the BIOS has truncated the drive after backing up a copy of itself to a small HPA (approximately 2000 sectors) at the top end of the drive.

GDB is detecting the correct partition size from the partition table in sector 0.

The reason the drive is reporting 33MB is that Gigabyte's BIOS has a bug that incorrectly adjusts the drive's capacity after creating the HPA. 1TB drives are reduced to 33MB, 1.5TB become 500GB, and 2TB become 1TB.

The solution is to use a tool such as HDAT2 or the HDD Capacity Restore Tool to remove the HPA (Host Protected Area).

I would also update the BIOS afterwards.

Update on MHDD32 solution
I had the problem of 1 TB Seagate Drive showing up as 33 MB on two different drives, and have no idea what caused the problem, but both had valuable data which caused me near heart failure when I could no longer see my drives (and partitons) any longer. After much searching on the web, I found the MHDD32 solution using the Ultimate Boot CD which worked successfully, and as a further bonus, lost absolutely none of my data after running the process. What a relief at being able to sleep peacefully that night. This is the solution which worked for me:

Download the Ultimate Boot CD ISO file (I used version 5.0.3) and burn it to a CD
Boot the CD
Select 'HDD'
Select 'Diagnosis'
Select the application 'MHDD32' (I used the V4.6 version)
Select '2. Start the computer without SCSI support.'
Reply to the "Enter HDD number" prompt. In my case it was 6
Type the command 'NHPA' (the description of this using the 'Help' command is 'Uncut (return to factory size)')
Reply 'y' to the "Do you want to set Native LBA address ? (y/N)" prompt
Reply 'y' to the "continue? (y/N)" prompt
The reply to this is "Done."

I did not need to do anything further and my drive was restored to its original state of being a 1 TB drive
and all the data on it fully preserved and accessable once again. What a relief !