SCSI mode page

SCSI target devices provide a number of SCSI mode pages. These can be interrogated by a MODE SENSE command and set by a MODE SELECT command. The MODE SENSE commands and the mode page formats include a 6-bit page code field, allowing for 64 possible mode pages. When the number of pages approached this limit, an eight-bit subpage code field was added. A description of many of these page codes is included below. Note that any given SCSI device type will only support a subset of the possible page codes, and some page codes may have different meanings for different devices.

## List of SCSI mode page codes

[1]

Page/Subpage Code | Description

|

00h/xxh | Vendor specific
01h/00h | Read-Write Error Recovery
02h/00h | Disconnect-Reconnect - allows the initiator to tune SCSI bus performance
03h/00h | Format Device (disk devices)
04h/00h | Rigid Disk Geometry
05h/00h | Flexible Disk
06h/00h | Optical Memory
06h/00h | RBC Device Parameters
07h/00h | Verify Error Recovery
08h/00h | Caching
0Ah/00h | Control - tagged queuing, extended contingent allegiance, asynchronous event notification, and error logging
0Ah/01h | Control Extension - timestamp, asymmetric logical unit access, initial command priority, maximum sense data length
0Bh/00h | Medium Types Supported
0Ch/00h | Notch and Partition
0Dh/00h | CD Device Parameters
0Eh/00h | CDROM Audio Control
0Eh/01h | Target Device (Automation/Drive Interface)
0Eh/02h | DT Device Primary Port parameters (Automation/Drive Interface devices)
0Eh/03h | Logical Unit parameters (Automation/Drive Interface devices)
0Eh/04h | Target Device Serial Number (Automation/Drive Interface devices)
10h/00h | Device Configuration
11h/00h | Medium Partition (1)
14h/00h | Enclosure Services Management
15h/00h | Extended
16h/00h | Extended Device-Type Specific
18h/00h | Protocol-Specific Logical Unit
19h/00h | Protocol-Specific Port
1Ah/00h | Power Conditions
1Ah/01h | Power Control
1Bh/00h | LUN Mapping
1Ch/00h | Informational Exceptions Control
1Ch/01h | Background Control
1Ch/02h | Logical Block Provisioning
1Dh/00h | Element Address Assignment (media changer devices)
1Eh/00h | Transport Geometry Parameters (media changer devices)
1Fh/00h | Device Capabilities (media changer devices)
20h-29h | Vendor specific
2Ah/xxh | Device-type specific
2Ah/00h | CD Capabilities and Mechanical Status
3Fh/xxh | return all pages and/or subpages (valid only for a MODE SENSE command)
xxh/FFh | return all subpages (valid only for a MODE SENSE command)

## References

1. ↑ "SCSI Primary Commands - 4 (SPC-4)" (PDF). https://raw.githubusercontent.com/ch3ach/GCS-BIOS/master/Doc/spc4r36e.pdf. Retrieved 2021-12-07.

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