Hard disk interface
Read here in more detail about the different interface types.
MFM and RLL
MFM and RLL are actually coding principles for the hard disks. They are not interface standards. The
coding occurs from controller to the hard disk. As a coding principle, RLL was more effective than was
MFM, so in the "old days" you could experiment using RLL controllers to MFM disks.
WD 1003
MFM as well as RLL are WD1003 compatible, meaning that the standards would work with the at that time
most widely used controller chip from Western Digital.
ST 506
ST 506 is an interface, which was used both with RLL and MFM. There is serial connection from controller
to disk. The ST 506 controller functions as as a converter from the serial read/write head data to the 8 or
16 bit parallel bus. ST 506 was the most widespread controller standard before IDE.
Read here in more detail about the different interface types.
MFM and RLL
MFM and RLL are actually coding principles for the hard disks. They are not interface standards. The
coding occurs from controller to the hard disk. As a coding principle, RLL was more effective than was
MFM, so in the "old days" you could experiment using RLL controllers to MFM disks.
WD 1003
MFM as well as RLL are WD1003 compatible, meaning that the standards would work with the at that time
most widely used controller chip from Western Digital.
ST 506
ST 506 is an interface, which was used both with RLL and MFM. There is serial connection from controller
to disk. The ST 506 controller functions as as a converter from the serial read/write head data to the 8 or
16 bit parallel bus. ST 506 was the most widespread controller standard before IDE.
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