Autodocs
Devices:
trackdisk.device
CMD_CLEAR
CMD_READ
CMD_UPDATE
CMD_WRITE
TD_ADDCHANGEINT
TD_CHANGENUM
TD_CHANGESTATE
TD_EJECT
TD_FORMAT
TD_GETDRIVETYPE
TD_GETGEOMETRY
TD_GETNUMTRACKS
TD_MOTOR
TD_PROTSTATUS
TD_RAWREAD
TD_RAWWRITE
TD_REMCHANGEINT
TD_SEEK
Include
GuruMeditation
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Docs » Autodocs » trackdisk.device » CMD_CLEAR
CMD_CLEAR/ETD_CLEAR -- mark the track buffer as containing invalid
data.
These commands mark the track buffer as invalid, forcing a
reread of the disk on the next operation. ETD_UPDATE or CMD_UPDATE
would be used to force data out to the disk before turning the motor
off. ETD_CLEAR or CMD_CLEAR are usually used after having locked out
the trackdisk.device via the use of the disk resource, when you
wish to prevent the track from being updated, or when you wish to
force the track to be re-read. ETD_CLEAR or CMD_CLEAR will not do an
update, nor will an update command do a clear.
IO REQUEST INPUT
io_Device preset by the call to OpenDevice()
io_Unit preset by the call to OpenDevice()
io_Command CMD_CLEAR or ETD_CLEAR
io_Flags 0 or IOF_QUICK
iotd_Count (ETD_CLEAR only) maximum allowable change counter
value.
IO REQUEST RESULT
io_Error - 0 for success, or an error code as defined in
<devices/trackdisk.h>
CMD_WRITE(), CMD_UPDATE()
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