version 1 showing authors affecting page license.
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perry |
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FD |
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!!!FD |
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NAME |
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CONFIGURATION |
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DESCRIPTION |
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NOTES |
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FILES |
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AUTHORS |
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SEE ALSO |
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---- |
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!!NAME |
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fd - floppy disk device |
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!!CONFIGURATION |
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Floppy drives are block devices with major number 2. |
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Typically they are owned by root.floppy and have either mode |
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0660 (access checking via group membership) or mode 0666 |
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(everybody has access). For the following devices, ''n'' |
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is the drive number. It is 0 for the first drive, 1 for the |
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second etc. To get a minor number for a specific drive |
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connected to the first controller, add ''n'' to the minor |
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base number. If it is connected to the second controller, |
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add ''n''+128 to the minor base number. __Warning: If |
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you use formats with more tracks than supported by your |
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drive, you may damage it mechanically.__ Trying once if |
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more tracks than the usual 40/80 are supported should not |
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damage it, but no warranty is given for that. Don't create |
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device entries for those formats to prevent their usage if |
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you are not sure. |
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Drive independent device files which automatically detect |
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the media format and capacity: |
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5.25 inch double density device files: |
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5.25 inch high density device files: |
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3.5 inch double density device files: |
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3.5 inch high density device files: |
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3.5 inch extra density device files: |
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!!DESCRIPTION |
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__fd__ special files access the floppy disk drives in raw mode. The following ioctl(2) calls are supported by __fd__ devices: |
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__FDCLRPRM__ |
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clears the media information of a drive (geometry of disk in |
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drive). |
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__FDSETPRM__ |
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sets the media information of a drive. The media information |
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will be lost when the media is changed. |
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__FDDEFPRM__ |
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sets the media information of a drive (geometry of disk in |
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drive). The media information will not be lost when the |
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media is changed. This will disable autodetection. In order |
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to re-enable autodetection, you have to issue an |
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__FDCLRPRM__ . |
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__FDGETDRVTYP__ |
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returns the type of a drive (name parameter). For formats |
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which work in several drive types, __FDGETDRVTYP__ |
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returns a name which is appropriate for the oldest drive |
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type which supports this format. |
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__FDFLUSH__ |
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invalidates the buffer cache for the given |
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drive. |
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__FDSETMAXERRS__ |
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sets the error thresholds for reporting errors, aborting the |
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operation, recalibrating, resetting, and reading sector by |
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sector. |
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__FDSETMAXERRS__ |
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gets the current error thresholds. |
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__FDGETDRVTYP__ |
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gets the internal name of the drive. |
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__FDWERRORCLR__ |
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clears the write error statistics. |
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__FDWERRORGET__ |
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reads the write error statistics. These include the total |
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number of write errors, the location and disk of the first |
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write error, and the location and disk of the last write |
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error. Disks are identified by a generation number which is |
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incremented at (almost) each disk change. |
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__FDTWADDLE__ |
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Switch the drive motor off for a few microseconds. This |
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might be needed in order to access a disk whose sectors are |
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too close together. |
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__FDSETDRVPRM__ |
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sets various drive parameters. |
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__FDGETDRVPRM__ |
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reads these parameters back. |
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__FDGETDRVSTAT__ |
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gets the cached drive state (disk changed, write protected |
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et al.) |
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__FDPOLLDRVSTAT__ |
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polls the drive and return its state. |
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__FDGETFDCSTAT__ |
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gets the floppy controller state. |
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__FDRESET__ |
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resets the floppy controller under certain |
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conditions. |
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__FDRAWCMD__ |
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sends a raw command to the floppy controller. |
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For more precise information, consult also the |
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!!NOTES |
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The various formats allow to read and write many types of |
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disks. However, if a floppy is formatted with a too small |
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inter sector gap, performance may drop, up to needing a few |
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seconds to access an entire track. To prevent this, use |
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interleaved formats. It is not possible to read floppies |
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which are formatted using GCR (group code recording), which |
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is used by Apple II and Macintosh computers (800k disks). |
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Reading floppies which are hard sectored (one hole per |
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sector, with the index hole being a little skewed) is not |
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supported. This used to be common with older 8 inch |
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floppies. |
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!!FILES |
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/dev/fd* |
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!!AUTHORS |
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Alain Knaff (Alain@linux.lu), David Niemi (niemidc@tux.org), |
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Bill Broadhurst (bbroad@netcom.com). |
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!!SEE ALSO |
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floppycontrol(1), mknod(1), chown(1), |
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getfdprm(1), superformat(1), mount(8), |
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setfdprm(1) |
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---- |