PC-DOS 320K format
Dan Tobias (Talk | contribs) |
|||
| (One intermediate revision by one user not shown) | |||
| Line 4: | Line 4: | ||
}} | }} | ||
| − | The '''PC-DOS 320K format''' was one of several low-capacity 5 1/4" disk formats used on IBM PCs and compatibles in the early days of PC-DOS before the [[PC-DOS 360K format]] became the standard. It used a double-sided, double-density disk with 40 tracks per side with 8 sectors per track, and 512 bytes per sector | + | The '''PC-DOS 320K format''' was one of several low-capacity 5 1/4" disk formats used on IBM PCs and compatibles in the early days of PC-DOS before the [[PC-DOS 360K format]] became the standard. It used a double-sided, double-density disk with 40 tracks per side with 8 sectors per track, and 512 bytes per sector. The disk turned at 300 RPM. These disks were generally used with [[FAT12]] file systems under the MS-DOS or PC-DOS operating system, but (far more rarely) were used with other filesystems too (e.g CP/M-86). The sector headers, etc, were based on [[IBM 3740]] format, albeit with [[MFM encoding]] (double density) replacing the original [[FM encoding]] (single density). |
This format was the double-sided counterpart of the [[PC-DOS 160K format]], but was soon superseded by the 360K format made possible by expanding the number of sectors per track to 9. | This format was the double-sided counterpart of the [[PC-DOS 160K format]], but was soon superseded by the 360K format made possible by expanding the number of sectors per track to 9. | ||
| Line 10: | Line 10: | ||
== Links == | == Links == | ||
* [http://www.textfiles.com/programming/FORMATS/formats.pro Info on MS-DOS 1.x - 2.x disk formats] | * [http://www.textfiles.com/programming/FORMATS/formats.pro Info on MS-DOS 1.x - 2.x disk formats] | ||
| + | * [http://www.computerhistory.org/_static/atchm/microsoft-ms-dos-early-source-code/ Early PC-DOS source code] | ||
[[Category:IBM]] | [[Category:IBM]] | ||
[[Category:Microsoft]] | [[Category:Microsoft]] | ||
Latest revision as of 10:29, 5 September 2024
The PC-DOS 320K format was one of several low-capacity 5 1/4" disk formats used on IBM PCs and compatibles in the early days of PC-DOS before the PC-DOS 360K format became the standard. It used a double-sided, double-density disk with 40 tracks per side with 8 sectors per track, and 512 bytes per sector. The disk turned at 300 RPM. These disks were generally used with FAT12 file systems under the MS-DOS or PC-DOS operating system, but (far more rarely) were used with other filesystems too (e.g CP/M-86). The sector headers, etc, were based on IBM 3740 format, albeit with MFM encoding (double density) replacing the original FM encoding (single density).
This format was the double-sided counterpart of the PC-DOS 160K format, but was soon superseded by the 360K format made possible by expanding the number of sectors per track to 9.
