Trackdisk Device, 303
  adding an interrupt handler, 314
  additional information, 322
  byte offset calculation, 307
  clearing the track buffer, 310
  closing, 308
  commands and functions, 304
  controlling the drive motor, 310
  determining drive geometry, 309
  determining the diskchange number, 313
  determing write-protect status, 312
  determining drive type, 312
  determining the number of tracks, 312
  determining the presence of a disk, 312
  device interface, 305
  diagnostic commands, 314
  ejecting a disk, 311
  enhanced commands, 305
  error codes, 317
  floppy disk I/O, 306
  formatting a track, 311
  iotd_Count, 305
  low-level access, 315
  moving the drive head, 314
  notification of disk changes, 314
  opening, 307
  reading raw data, 315
  reading, 307
  removing an interrupt handler, 314
  restrictions, 306
  sector label, 306
  status commands, 311
  updating a track sector, 310
  writing raw data, 316
  writing, 308