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Windows 98 uses FAT32 partitions. A FAT32 partition has a maximum theoretical size of 8 TB, but with 512-byte sectors found on most hard drives, you cannot have a FAT32 partition of more than 2 TB.

Also, Windows 98 does not support LBA48 addressing by default, though there is a patch available. Without both this patch and a BIOS capable of LBA48 addressing (all BIOS from 2002 and later can), you cannot access ANY part of the hard drive, be it partitioned or not, beyond 127 GB. So the largest practical partition size for any Windows 98-era computer is a 127 GB partition on a 127 GB hard drive. Anything larger than that is unusable.

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15y ago
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13y ago
Short answerSomewhere between 504 MB and 46 TB. Long answerSize limitations are based on a combination of the BIOS, file system, and tools used to create / manage the file systems. Most versions of Windows rely on the BIOS for accessing the hard drive. If the BIOS is unable to address the full capacity of the drive (for various reasons), Windows won't be able to use it either. 504 MB is the lowest barrier you are likely to find on a computer with Windows 95; the barrier was overcome after mid-1994. Other BIOS barriers that may pose an issue are:
  • The 4096 cylinder (1.97 GB) barrier - was overcome after 1996
  • The 6322 cylinder barrier (very uncommon).
  • The Int13h (7.88 GB) barrier - very common; a BIOS upgrade may be available
  • The 65536 cylinder (31.5 GB) barrier - fixed by June 1999
  • The ATA28 (128 GB) barrier - found in most systems before 2002.

BIOS updates or an add-on disk controller may be available to work around these BIOS barriers.

The other important barrier is the file system. FAT16 is limited to an approximately 2 GB partition size. You can have up to three primary partitions and one extended partition on a hard drive. While there is no official limit to the number of logical partitions you can have, you can only have a maximum of 26 drives/partitions usable in Windows 95. With A: and B: being reserved for the floppy drives, and D: probably being used by the CD-ROM drive, that's a maximum of 23 * 2 GB, or 46 GB of space being usable with FAT16.

FAT32 is available for Windows 95, but only in OEM releases OSR2 and later. With FAT32, the partition limit is raised to 2 TB. 23 * 2 TB = 46 TB. However, the generic IDE driver in Windows 95 isn't capable of accessing above 128 GB, even if the BIOS can. There is a shareware driver that should be capable; some motherboards may also have a specific driver.

One final issue is that most of the tools included with Windows 95 simply won't work above 32 GB disks. ScanDisk, Disk Defragmenter, and FDISK won't work. You can either use third-party utilities, or copy them from Windows 98/ME.

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14y ago

Regardless of operating system, you can only have up to four primary partitions per hard drive on a PC with a legacy BIOS.

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14y ago

Up to the end of the alphabet.

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Q: How many primary partitions can be created on Windows 98?
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