![]() ![]() For Macs running System 7.5.2 through 8.0, the limit is 4 GB (specifically 4,063 MB) per partition, and PCI-based Macs can access up to 2 TB partitions. Mac Size LimitationsĮarly versions of the Classic Mac OS (prior to 7.5.2) have a 2 GB limit per partition, so higher capacity drives need only be partitioned into multiple 2 GB (or smaller) segments. #Smallest size mac os partition Pc#Old BIOS-based PCs and older Macs have a 2 TB ceiling, and the workaround is a PC or Mac that uses EFI and runs a 64-bit operating system. More recently, as hard drives have passed 2 TB capacity, we’ve run into another capacity problem. #Smallest size mac os partition windows#Windows XP requires Service Pack 1 for drives over 128 GB. ![]() Windows 95 (revision 2) and Windows 98 can use 128 GB/137 GiB.MS-DOS and Windows 95 (original version) top out at 8.4 GB. ![]() Some older PCs with an Award or AMI BIOS have a capacity limitation of 36 GB (33.8 GiB), and “traditional” ATA has the 137 GB/128 GiB limitation noted above, so it can be problematic adding drives over 128 GB to older PCs as well as most pre-2002 Macs.Īnd then there’s the operating system, which may have even lower capacity limitations than the drive itself and the PC’s BIOS support: Back in 1986, 500 MB must have seemed like an incredible amount of storage space because the largest PC hard drives in those days were about 40 GB. That is a fixed limit locked in place by the combination of the computer’s BIOS and the drive’s ATA version. Problem is, when you combine the two, you get a real world limitation of 1,024 cylinders, 63 sectors, and 16 heads, which works out to 528 MB (504 MiB). The early ATA specification supports 65,536 cylinders of up to 255 sectors and up to 16 heads, for a theoretical maximum drive size of 127.5 GB. The original PC BIOS supports up to 1,024 cylinders of up to 63 sectors and up to 255 heads, giving a theoretical limit of 8.4 GB (7.8 GiB).
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