The following diagram illustrates a ST-506/IDE unit parameter structure:
ST-506-Driver-Parameters::= ─┬─ /V ─────────────────────
│
└────────┘
ST-506-Adapter-Parameters::=
── /A:d ───┬──────────────────────────┬──────────
├── /I ─ │
│ ├── /<!>R ─│ │
│ ├── /IRQ:dd ─│ │
│ ├── /PORT:hhhh ─│ │
│ └────────────────┘ │
└────────────────────────────┘
ST-506-Unit-Parameters::=
─── /U:d ───┬─ /GEO ─┬─ dd ──┬┬┬┬─
│ ├── (dddd,dddd,dddd) ─││││
│ ││ └──────────────────────┘│││
│ │├── /T:dddd ─────────────────────┤││
│ │├── /SMS ─────────────────────┤││
│ │└── /LBA ─────────────────────┘││
│ └───────────────────────────────────┘│
└───────────────────────────────────────────────┘
ST-506/IDE Adapter Device Driver Parameters
This parameter displays the adapter device driver level, disk controller status and drive geometry information during the OS/2 system initialization.
This parameter indicates that the IBM1S506 driver should not attempt to initialize the adapter indicated.
This adapter device driver automatically attempts to locate and initialize
both the primary and secondary adapters. In some cases other DASD controllers
may appear between the primary and secondary IDE controllers.
In these cases the system should be configured as follows:
──────────────────────────────────────────────────────────────────────────
BASEDEV=IBM1S506.ADD /V /A:1 /I BASEDEV=MOREDASD.ADD BASEDEV=IBM1S506.ADD /V /A:0 /I
──────────────────────────────────────────────────────────────────────────
If this parameter is negated (/!R), adapter resets are disabled. In most cases resets are beneficial to assist in recovering from transient hardware problems such as lost interrupts, timeouts, or commands a particular adapter may not support.
However, for some ESDI adapters, options set by vendor unique commands such as "Sector Sparing" may be lost after a reset. Setting this switch is recommended for ESDI adapters with disks formatted using "Sector Sparing."
This parameter overrides the default IRQ Number for the adapter indicated. The default IRQ address for Adapter 0 is (14) and for Adapter 1 is (15).
This parameter specifies the fixed disk drive number to which options following this parameter apply. Fixed disk drive numbers start at 0.
This parameter overrides the Cylinder/Head/Sector geometry for the unit selected. The fourth parameter is the Write Precompensation Cylinder which may be omitted for drives which do not require precompensation.
As an alternate format standard BIOS drive types may be used. Types (0-47) are supported. User defined types 47-49 should be entered directly by in the previous format.
If a second set of geometry is present, then the first set specifies the physical geometry of the drive, and the second set indicates the translated geometry which is reported to the OS/2 system.
This parameter indicates the total allowable error recover time for a request. Error recovery times < 5 seconds will be ignored. This parameter defaults to 30 seconds. A shorter interval may be desirable for fault tolerant applications.
This parameter enables Set Multiple Support which the improves performance of some IDE drives. If the drive does not have this feature, this switch will be ignored. The /V - (Verbose) option will indicate whether this feature has been enabled on a particular drive.
This parameter enables Logical Block Support for IDE drives which support this option. The /V - (Verbose) option will indicate whether this feature has been enabled on a particular drive.