I've had nothing but problems with my super slim ps3 I've had 8 in the last 2 years so I've decided to go back to a more reliable slim but don't know if my hdd will be compatible. Can anyone help.
The 2.5" drive should be 9mm in height. The older 12mm height drives won't fit, but if you have any of those laying around, they're really old and you should purchase a newer model anyhow.
Both the PS3 Slim and Super Slim support any 2.5" hard drive, so switching drives between the two won't be an issue. There may be an issue in that the drive won't be recognised and it'll need to be formatted, but you won't know this until you try.
The 2.5" drive should be 9mm in height. The older 12mm height drives won't fit, but if you have any of those laying around, they're really old and you should purchase a newer model anyhow.