2.3.46 FSCTL_QUERY_SPARING_INFO Reply

This message returns the results of the FSCTL_QUERY_SPARING_INFO request (section 2.3.45).


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SparingUnitBytes

SoftwareSparing

Reserved

TotalSpareBlocks

FreeSpareBlocks

SparingUnitBytes (4 bytes): A 32-bit unsigned integer that contains the size, in bytes, of a sparing packet, which is the same as the underlying error check and correction (ECC) block size of the media. For more information, see [UDF].

SoftwareSparing (1 byte): A Boolean (section 2.1.8) value. If TRUE, indicates that sparing behavior is software-based; if FALSE, it is hardware-based.

Reserved (3 bytes): A 24-bit reserved value. This field SHOULD be set to zero, and MUST be ignored.

TotalSpareBlocks (4 bytes): A 32-bit unsigned integer that contains the total number of blocks allocated for sparing.

FreeSpareBlocks (4 bytes): A 32-bit unsigned integer that contains the number of blocks available for sparing.

This message returns a status code as specified in section 2.2. Upon success, the status code returned by the function that processes this FSCTL is STATUS_SUCCESS. The most common error codes are listed in the following table.

Error code

Meaning

STATUS_INVALID_PARAMETER

0xC000000D

An invalid parameter was passed to a service or function, or the buffer is too small to contain the entry.

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