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I upgraded my TP750Cs tonight from 340 MB to 720 MB using an IBM OEM Model DB0A-2720 (1400 Cyl, 16 Hd, 63 Sec/Tr) drive (FDISK claims it is 688.04 MB -- DIR after FORMAT shows 720+ MB available space. Now, I made the mistake of making the entire drive one partition -- so the cluster size is 16384 bytes. Could someone send me a table breaking down partition size vs cluster size -- so I might subdivide my disk optimally to avoid having a bunch of tiny files allocated in area with huge cluster size. I have in mind making a small partition #1 containing minimal 32 MB DOS6.22, Windows 3.1, IBM Card Services, and Adaptec EZ-SCSI with Backup Basics. I'll boot from this partition for system backups and restores. This should save enormous amount of time which is otherwise wasted rebuilding these items to just to restore backup from tape to another disk partition. This would have the added advantage of maintaining my directory of backup tape contents so I don't have to rescan a tape to catalog it before restoring it. Partition #2 would be the main partition for smaller programs containing many small files -- the partition size would be set to generate small cluster size. Partition #3 would be for large programs, testing or portable development using sytems like Win95/WinNT + MS C++ Professional, OS/2 with IBM C++, linux, etc. Cheers, Alexander