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HP-UX Reference > D


HP-UX 11i Version 3: February 2007

Technical documentation

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diskinfo — describe characteristics of a disk device


/usr/sbin/diskinfo [-b|-v] character_devicefile


The diskinfo command determines whether the character special file named by character_devicefile is associated with a SCSI or floppy disk drive. If so, diskinfo summarizes the disk's characteristics.

The diskinfo command displays information about the following characteristics of disk drives:

Vendor name

Manufacturer of the drive (SCSI only)

Product ID

Product identification number or ASCII name


floppy or SCSI classification for the device


Size of disk specified in bytes


Specified as bytes per sector

Both the size of disk and bytes per sector represent formatted media.


The diskinfo command recognizes the following options:


Return the size of the disk in 1024-byte sectors.


Display a verbose summary of all of the information available from the device. For floppy drives, this option has no effect.

SCSI disk devices return the following:

Vendor and product ID Device type Size (in bytes and in logical blocks) Bytes per sector Revision level SCSI conformance level data


As of release 10.20 of HP-UX, certain IDE devices, CD-ROMs in particular, will respond to diskinfo inquiries as if they were SCSI devices. Therefore, the text "SCSI describe" in the output of the diskinfo command does not definitively mean that the disk is in fact a SCSI drive (especially in the case of CD-ROMs). Use ioscan(1M), ioscan -fn, and check which type of INTERFACE node, SCSI or IDE, the device's hardware path lies beneath, in order to definitively determine a drive's interface.



The diskinfo command supports floppy and HP SCSI disk devices.

SCSI Devices

The SCSI specification provides for a wide variety of device-dependent formats. For non-HP devices, diskinfo may be unable to interpret all of the data returned by the device. Refer to the drive operating manual accompanying the unit for more information.


diskinfo was developed by HP.

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