Data Recording
Last revision of this page: March 7, 2025
From Single to Extra High Density
The following information generally refers to IBM compatible computers running the PC/MS-DOS operating system. Only the SD and QD applies to the CP/M operating system.
Single Density FM (frequency modulation)
longitudinal recording
48 tpi (tracks per inch - track density)
125 KBit/s (transfer rate)
not supported within PC/MS-DOS
Double Density MFM (modified frequency modulation)
longitudinal recording
48 tpi (tracks per inch - track density)
250 KBit/s (transfer rate)
9(8) sectors/track
Quad Density MFM (modified frequency modulation)
longitudinal recording
96 tpi (tracks per inch - track density)
250 KBit/s (transfer rate)
9 sectors/track
not supported within PC/MS-DOS
High Density MFM (modified frequency modulation)
longitudinal recording
135(96) tpi (tracks per inch - track density)
500 KBit/s (transfer rate)
18(15) sectors/track
Extra High Density MFM (modified frequency modulation)
perpendicular recording
135 tpi (tracks per inch - track density)
1.000 KBit/s (transfer rate)
36 sectors/track
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