How to recover data from a failed My Book World edition?

Cheers for the reply,

doesn’t help though…

I can boot up using the suggested software, but it will only see 3 partitions on the 1TB drive… (ext partitions)
A tool which i know of already is included in that PartedMagic, called “Test Disk”.

If i run that, it see the HDD size as 147gb ???
Yet run the disc tool/SMART, and it will see it is a 1TB drive…

I have around 300GB of data on that drive, and i would say 70GB is very important to me…

Just so i can understand this a bit more, the  ‘My Book World Edition’ with a single 1TB drive, is made up of:

5 partitions ??? or 4 ???
Is that 3 in EXT format, and 1 in XFS (for data) ???