Device managers provide a uniform interface between their clients and adapter device drivers. Device manager clients normally are an OS/2 installable file system or the OS/2 kernel but can be other device drivers.

The interface between a device manager and the adapter device drivers managed is defined in this reference. The interface between device managers and the clients they service is defined by the client's interface specification.

IBM provides the devices managers shown in the following table:

┌─────────────────┬──────────────────┬─────────────────────────┐
│Device Manager   │Client            │Client Specification     │
├─────────────────┼──────────────────┼─────────────────────────┤
│OS2DASD.DMD      │OS/2 File Systems │OS/2 Physical Device     │
│                 │                  │Driver Reference         │
├─────────────────┼──────────────────┼─────────────────────────┤
│OS2SCSI.DMD      │SCSI.SYS option   │OS/2 SCSI Device Driver  │
│                 │drivers           │Specification            │
├─────────────────┼──────────────────┼─────────────────────────┤
│OS2ASPI.DMD      │ASPI option       │Advanced SCSI Programming│
│                 │drivers           │Interface                │
├─────────────────┼──────────────────┼─────────────────────────┤
│OS2CDROM.DMD     │CD-ROM File System│OS/2 CD-ROM Interface    │
└─────────────────┴──────────────────┴─────────────────────────┘