External HDD lost space after format

I wanted to use a 160GB external USB hard drive with an old powerbook G4.the problem is that the Mac can't write to NTFS, so I used the disk utility that comes with OS X 10.4 to format it to HFS+ (Mac OS Extended, Journaled).

i don't why, but it reformated it to 74.8GB (the same space that powerbook has).
then I tried to reformat it back to NTFS to see if i get back the space - it didnt

i connected it to a windows 7 machine and used the disk managment utility to see if there is unallocated space on the hard drive - there wasnt

its showing 74GB and no matter how i reformatted it - it remained the same space
i even tried to use a program to low level format it (called, Hard Disk Low Level Format Tool, here a link to the web page - http://hddguru.com/) - it didn't help.

i ended up just formatting it back to NFS+ so the powerbook can at least use the 74GB for now until i find a solution

any help?

 

its actually just a regular old notebook Fujitsu 2.5 hard drive inside an external case, but i'll check their website, thanks for the idea.
i'll post if this helped

 

unfortunately didn't find something like that on their web page.