CMD_WRITE

write sectors of data to a disk.

This command transfer data from a supplied buffer to a disk.

io_Device

preset by the call to OpenDevice()

io_Unit

preset by the call to OpenDevice()

io_Command

CMD_WRITE

io_Flags

0 or IOF_QUICK

io_Data

pointer to the buffer where the data should be put

io_Length

number of bytes to write, must be a multiple of the disk block size.

io_Offset

byte offset from the start of the disk describing where to write data to, must be a multiple of the disk block size.

io_Error

0 for success, or an error code as defined in <devices/trackdisk.h>

This command can only reach data below the 4GB barrier. To write data beyond the barrier, use TD_WRITE64 instead.

Some incarnations of the scsi.device, namely those that handle actually IDE devices, were unable to write more than 255 blocks in one go. This bug has been fixed in V47.

TD_WRITE64, CMD_READ, TD_FORMAT