function (ULONG) - input

The type of information to obtain about the partitionable disks.

Possible values are shown in the following list:

• INFO_COUNT_PARTITIONABLE_DISKS
  Obtain the total number of partitionable disks.

• INFO_GETIOCTLHANDLE
  Obtain a handle to use with Category 09h Physical Disk Control IOCtl Commands.

• INFO_FREEIOCTLHANDLE
  Release a handle for a partitionable disk.

pBuf (PVOID) - input

The address of the buffer where the returned information is placed.

The output data for each function is shown in the following list (all lengths are in bytes):

┌──────────┬──────────┬────────────────────────────────────────┐│Function  │DataLen   │Returned Information                    │
├──────────┼──────────┼────────────────────────────────────────┤
│ 1        │ 2        │Total number of partitionable disks in  │
│          │          │the system (1-based).                   │
├──────────┼──────────┼────────────────────────────────────────┤
│ 2        │ 2        │Handle for the specified partitionable  │
│          │          │disk for the Category 09h Physical Disk │
│          │          │Control IOCtl Commands.                 │
├──────────┼──────────┼────────────────────────────────────────┤
│ 3        │ 0        │None - pointer must be zero.            │
└──────────┴──────────┴────────────────────────────────────────┘

cbBuf (ULONG) - input

The length, in bytes, of the data buffer.

pParams (PVOID) - input

The address of the buffer used for input parameters.

The input parameters required for each function are as follows (all lengths are in bytes):

┌──────────┬─────────────┬─────────────────────────────────────┐│Function  │ParmLen      │Input Parameters                     │
├──────────┼─────────────┼─────────────────────────────────────┤
│ 1        │ 0           │None - must be set to zero.          │
├──────────┼─────────────┼─────────────────────────────────────┤
│ 2        │string length│ASCIIZ string that specifies the     │
│          │             │partitionable disk.                  │
├──────────┼─────────────┼─────────────────────────────────────┤
│ 3        │ 2           │Handle obtained from Function 2.     │
└──────────┴─────────────┴─────────────────────────────────────┘

The ASCIIZ string used to specify the partitionable disk must be of the following format:

number : <null byte>

Where:

number

specifies the partitionable disk number (1-based) in ASCII.
colon ( : )
must be present.
<null byte>
is the byte of zero for the ASCIIZ string.

cbParams (ULONG) - input

The length, in bytes, of the parameter buffer.

ulrc (APIRET) - returns

Return Code.

DosPhysicalDisk returns one of the following values:

• NO_ERROR 1
  ERROR_INVALID_FUNCTION
  87
  ERROR_INVALID_PARAMETER
  For a full list of error codes, see Errors.

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