TI Disk format

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See File systems for details of

the Floppy Disk File System

  • Volume Information Block
  • File Descriptor Index Record
  • File Descriptor Records
  • Allocation Bit Map

and the Hard Disk File System

  • Volume Information Block (HFDC)
  • Volume Information Block (SCSI)
  • Directory Descriptor Records
  • File Descriptor Index Records
  • File Descriptor Records
  • Allocation Bit Map


Detailed description of disc format

A single sided single density 90k diskette used with the T.I. Disc Controller has the following specifications:

  • Diskette type: SA 104 (ANSI standard 5.25")
  • Encoding method: FM single density
  • Capacity: 92l6O bytes per disc
  • Track size: 2304 bytes
  • Sector size: 256 bytes
  • Tracks per side: 40 tracks
  • Sectors per track: 9 sectors


See the BASIC program Disk directory reader in BASIC.