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
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) |