@MiAmigo
The simple answer is this Buy PFS3 or download SFS for free both give you the ability to use Hard Drives of any size and huge partition sizes. PLUS they are faster than FFS and you can no longer invalidate a hard drive. You can literaly pull the plug while copying a file and not invalidate your hard drive. PS I have tried that monuever to test thier claims and it actually works!!!
Why any Amiga user currently still uses FFS is really beyond me.
I currently use SFS with my A1 and I can tell you I recently mounted a 250 Gig HD with only one 250 Gig partition and it worked just fine.
The only problem I have ever encountered using PFS or SFS is on a GVP SCSI card as It DOES NOT FOLLOW THE RDB SPECIFICATIONS AS LAID OUT BY COMMODORE BACK IN THE LATE EIGHTIES.
In that case your boot drive must be a FFS partition but your others can be anything you like. If your are using OS3.9 and the new ROMupdates then you can also use larger size drives only your boot partition must reside in the first 4.3 gigs
Hope that help
Kgrach