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.
| 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) |