2.6.2.1 File Parameters
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1 |
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2 |
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BlockSize |
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BlockSize (4 bytes): Specifies the size of each payload block in bytes. The value MUST be at least 1 MB and not greater than 256 MB, and MUST be a power of 2.
A - LeaveBlockAllocated (1 bit): Specifies whether blocks can be unallocated from the file. If this field is set to 1, the implementation SHOULD NOT change the state of any blocks to a BLOCK_NOT_PRESENT state, and the implementation MUST NOT reduce the size of the file to a value lower than would be required to allocate every block. This field is intended to be used to create a fixed VHDX file that is fully provisioned. Ignored if HasParent is set.
B - HasParent (1 bit): Specifies whether this file has a parent VHDX file. If set, the file is a differencing file, and one or more parent locators specify the location and identity of the parent. LeaveBlockAllocated is ignored when HasParent is set.
Reserved (30 bits): MUST be 0.