atapi_ide man page on DigitalUNIX

Man page or keyword search:  
man Server   12896 pages
apropos Keyword Search (all sections)
Output format
DigitalUNIX logo
[printable version]

atapi_ide(7)							  atapi_ide(7)

NAME
       atapi_ide - Interface for ATAPI or IDE (PC) devices

SYNOPSIS
       PCI bus CMD/Acer ATAPI/IDE adapter:
	  bus pci0 at *
	   bus ata0 at *
	   controller scsi0 at ata0 slot 0
	   controller scsi1 at ata0 slot 1

       PCI bus Cypress ATAPI/IDE adapter:
	  bus pci0 at *
	   bus ata0 at *
	   bus ata1 at *
	   controller scsi0 at ata0 slot 0
	   controller scsi1 at ata1 slot 0

       PCMCIA bus ATA/IDE disk card:
	  bus pcmcia0 at *
	   bus ata0 at pcmcia?
	   controller scsi0 at ata0

DESCRIPTION
       Devices	commonly  known	 for  their  use  on  PC devices as ATA or IDE
       devices are supported using the SCSI CAM device driver.	The ATA	 stan‐
       dard has also been expanded to include what are known as ATAPI devices.
       The SCSI CAM device driver is also used	for  those  disks  and	CD-ROM
       devices.	 These	devices may also be known under the names EIDE, ATA-2,
       Fast-ATA, or Ultra-ATA.

       Beacuse the ATA/IDE standard was not developed until after many of  the
       devices	that  used this standard were produced, there are many devices
       which do not strictly comply with the standard.	While it  is  possible
       some  industry standard devices may appear to work, it is also possible
       they will cause hang or data corruption	cases  when  used  under  more
       stressful situations.  For this reason, it is recommended that only the
       supported devices be used.  These devices have been tested and are cer‐
       tified for correct operation.

       ATAPI/IDE  controllers  allow the connection of two devices.  These two
       devices are known as the master device and the slave device.   If  only
       one  device  is	connected,  that device must be the master (slave-only
       configurations are not supported).  When used by the  SCSI  CAM	device
       driver,	the  IDE  master  device  is  assigned SCSI id 0 for that con‐
       troller. The slave device is assigned SCSI id 1	for  that  controller.
       No  other  SCSI	ids  are  assigned on that controller.	Most ATAPI/IDE
       adapters contain two channels (known as	the  primary  and  secondary).
       Each  of these channels may contain their own master and slave devices.
       Therefore, a dual channel ATAPI/IDE controller  may  contain  up	 to  4
       devices (a master and slave pair on each channel).  These 4 devices are
       then accessed as SCSI id 0 and 1 on each channel.

       Many SCSI operations translate perfectly for use on IDE.	 For  example,
       read  and  write operations are the same.  However, many SCSI disk mode
       pages are emulated by the IDE device driver.  For example, you can dis‐
       play the SCSI inquiry mode pages using the following command:

       % scu show inq pages

       pages  are  created by the device driver to contain the long (full IDE)
       form of the device name, serial number, revision, and  the  operational
       modes  of  the device.  Only a shortened version of this information is
       available with the standard SCSI inquiry command.  Note also  that  the
       following command:

       % scu show pages

       Shows  that the SCSI mode pages contain only partial information.  Only
       that information (such as geometry) that the drive reports to the  sys‐
       tem  is	able  to  be  reformatted into these emulated SCSI mode pages.
       Much of the information (such as RPM) is simply not available from  the
       drive, and therefore not accurately reported.

       ATAPI  devices  are  much  more closely related to SCSI devices, and as
       such contain their own mode pages.  Therefore, for these	 devices,  the
       mode  page  values reported are those from the device, and no emulation
       is involved.

       ATAPI tape devices are not supported at this time.

FILES
       /dev/disk/dsk???

       /dev/disk/dsk???

SEE ALSO
       SCSI(7), rz(7), and disklabel(8)

								  atapi_ide(7)
[top]

List of man pages available for DigitalUNIX

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net