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I have a disk over 2.1 GB in a system that has BIOS translation, that FDISK or other utilities see as either only 2.1 GB or as a much smaller disk, say only around 400 MB in size
Explanation: There is a hard disk over 2.1 GB in size being used in a system that supports BIOS translation. The disk's size is being presented as either truncated to only 2.1 GB, or it is showing up as a much smaller number like 400 MB for a 2.5 GB drive.
Diagnosis: The most likely cause of this problem is that while your BIOS supports translation, it is not correctly handling disks that have over 4,096 cylinders. There were some BIOSes that did not handle these larger disks correctly; this is one of the hard disk size barriers. Different BIOSes handle these larger disks differently when they aren't supported properly. Some simply truncate the disk to 4,096 cylinders so that the disk appears to be 2.1 GB in size, and others "wrap around" so that they show up as 400 MB (2.5 GB minus 2.1 GB). This is discussed here.
Tip: If this disk is
showing up as 504 MB or 528 MB, this is a sign that BIOS translation is not functioning on
the machine. Continue here.