As long as the drive is a 50-pin SCSI-1 drive, I don't think there is any hardware limit…
Of course, 7.5.5 has a partition limit of 4gb or so, unless you want 18 partitions (on a 75GB disk) you probably want a smaller one!
Of course, 7.5.5 has a partition limit of 4gb or so, unless you want 18 partitions (on a 75GB disk) you probably want a smaller one!