Hard Disk History

Original IBM PC did not have or support a hard drive. (1981)
DOS 2 was introduced, with support for storage devices.
First hard drives appear as external devices with own power supply.
The IBM XT comes out with a 10MB hard disk built in. (1983)
The IBM AT introduces an entirely different approach to hard disk systems. (1984)
DOS 4.0 is released, allowing for larger partitions on the harddrive, thereby allowing
larger harddrives.
The IDE standard was proposed by Western Digital and Compaq (1986) in order to
deal with performance limitations.
EIDE (Enhanced IDE) was introduced by Western Digital (1993) to overcome
limitations in ATA, which IDE was a part of.

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