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[MS-VDS]: Virtual Disk Service (VDS) Protocol Specification

[MS-VDS]: Virtual Disk Service (VDS) Protocol Specification

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•Dynamic disk volumes - The flag is per volume. <strong>VDS</strong>_VF_NO_DEFAULT_DRIVE_LETTER isset at volume creation. Dynamic will be the same as basic GPT on Windows Vista, WindowsServer 2008, Windows 7, Windows Server 2008 R2. The flag toggles when drive letters areassigned or removed, and can also be set or cleared using any of the Set/ClearFlags methods.•MBR basic disk volumes - The flag is applied to all volumes created on the disk after the flag isset. It is set per disk for basic MBR disks, not per volume. The flag is only set or cleared if anexplicit call is made to the IVdsVolume::SetFlags (section 3.4.5.2.30.10) andIVdsVolume::ClearFlag (section 3.4.5.2.30.11) methods, respectively. For example, the<strong>VDS</strong>_VF_NO_DEFAULT_DRIVE_LETTER flag is not toggled as drive letters are assigned to orremoved from specific volumes.•GPT basic disk volumes - The flag is per volume, data partitions only.<strong>VDS</strong>_VF_NO_DEFAULT_DRIVE_LETTER is set at volume creation, and toggled when driveletters are assigned or removed (by <strong>VDS</strong>). Section 2.2.1.2.23: For Windows Server 2003 and Windows Server 2003 R2,<strong>VDS</strong>_VF_NO_DEFAULT_DRIVE_LETTER cannot be set or cleared on dynamic disk volumes, andis always enabled. On basic disks, it is disabled by default, and the flags can only be changed usingthe IVdsVolume::SetFlags (section 3.4.5.2.30.10) and IvdsVolume::ClearFlag (section3.4.5.2.30.11) methods. Assigning or removing a drive letter does not toggle the flag for basic GPTdisks. Section 2.2.1.2.23: Windows Vista, Windows Server 2008, and Windows Server 2008 R2 useBitLocker full-volume encryption. Section 2.2.1.3.1: This notification is never sent by the Windows implementation of the<strong>Virtual</strong> <strong>Disk</strong> <strong>Service</strong>. Section 2.2.1.3.11: Windows recognizes the following partition types on MBR disks and treatsall others as OEM partitions (which do not automatically get assigned drive letters except inWindows Preinstallation Environment (Windows PE)):Value0x000x010x040x050x060x070x0B0x0C0x0E0x0F0x42MeaningAn unused entry.Partition with 12-bit FAT entries.Partition with 16-bit FAT entries.Extended partition entry.<strong>MS</strong>-DOS version 4 huge partition.Installable file system (IFS) partition.FAT32 partition.FAT32 partition using extended INT13 services.16-bit FAT partition using extended INT13 services.Extended partition using extended INT13 services.Logical disk manager (LDM) data partition.338 / 360[<strong>MS</strong>-<strong>VDS</strong>] — v20110610<strong>Virtual</strong> <strong>Disk</strong> <strong>Service</strong> (<strong>VDS</strong>) <strong>Protocol</strong> <strong>Specification</strong>Copyright © 2011 Microsoft Corporation.Release: Friday, June 10, 2011

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