private void EstablishReservedPartition(List <GptEntry> allEntries)
{
// If no MicrosoftReserved partition, and no Microsoft Data partitions, and the disk
// has a 'reasonable' size free, create a Microsoft Reserved partition.
if (CountEntries(allEntries, e => e.PartitionType == GuidPartitionTypes.MicrosoftReserved) == 0 &&
CountEntries(allEntries, e => e.PartitionType == GuidPartitionTypes.WindowsBasicData) == 0 &&
_diskGeometry.Capacity > 512 * 1024 * 1024)
{
long reservedStart = FirstAvailableSector(allEntries);
long reservedEnd = FindLastFreeSector(reservedStart, allEntries);
if ((reservedEnd - reservedStart + 1) * _diskGeometry.BytesPerSector > 512 * 1024 * 1024)
{
long size = (_diskGeometry.Capacity < 16 * 1024L * 1024 * 1024 ? 32 : 128) * 1024 * 1024;
reservedEnd = reservedStart + size / _diskGeometry.BytesPerSector - 1;
int reservedOffset = GetFreeEntryOffset();
GptEntry newReservedEntry = new GptEntry();
newReservedEntry.PartitionType = GuidPartitionTypes.MicrosoftReserved;
newReservedEntry.Identity = Guid.NewGuid();
newReservedEntry.FirstUsedLogicalBlock = reservedStart;
newReservedEntry.LastUsedLogicalBlock = reservedEnd;
newReservedEntry.Attributes = 0;
newReservedEntry.Name = "Microsoft reserved partition";
newReservedEntry.WriteTo(_entryBuffer, reservedOffset);
allEntries.Add(newReservedEntry);
}
}
}
/// <summary>
/// Creates a new partition that encompasses the entire disk.
/// </summary>
/// <param name="type">The partition type</param>
/// <param name="active">Whether the partition is active (bootable)</param>
/// <returns>The index of the partition</returns>
/// <remarks>The partition table must be empty before this method is called,
/// otherwise IOException is thrown.</remarks>
public override int Create(WellKnownPartitionType type, bool active)
{
List <GptEntry> allEntries = new List <GptEntry>(GetAllEntries());
// If no MicrosoftReserved partition, and no Microsoft Data partitions, and the disk
// has a 'reasonable' size free, create a Microsoft Reserved partition.
if (CountEntries(allEntries, e => e.PartitionType == GuidPartitionTypes.MicrosoftReserved) == 0 &&
CountEntries(allEntries, e => e.PartitionType == GuidPartitionTypes.WindowsBasicData) == 0 &&
_diskGeometry.Capacity > 512 * 1024 * 1024)
{
long reservedStart = FirstAvailableSector(allEntries);
long reservedEnd = FindLastFreeSector(reservedStart, allEntries);
if ((reservedEnd - reservedStart + 1) * _diskGeometry.BytesPerSector > 512 * 1024 * 1024)
{
long size = ((_diskGeometry.Capacity < (16 * 1024L * 1024 * 1024)) ? 32 : 128) * 1024 * 1024;
reservedEnd = reservedStart + (size / _diskGeometry.BytesPerSector) - 1;
int reservedOffset = GetFreeEntryOffset();
GptEntry newReservedEntry = new GptEntry();
newReservedEntry.PartitionType = GuidPartitionTypes.MicrosoftReserved;
newReservedEntry.Identity = Guid.NewGuid();
newReservedEntry.FirstUsedLogicalBlock = reservedStart;
newReservedEntry.LastUsedLogicalBlock = reservedEnd;
newReservedEntry.Attributes = 0;
newReservedEntry.Name = "Microsoft reserved partition";
newReservedEntry.WriteTo(_entryBuffer, reservedOffset);
allEntries.Add(newReservedEntry);
}
}
// Fill the rest of the disk with the requested partition
long start = FirstAvailableSector(allEntries);
long end = FindLastFreeSector(start, allEntries);
int offset = GetFreeEntryOffset();
GptEntry newEntry = new GptEntry();
newEntry.PartitionType = GuidPartitionTypes.Convert(type);
newEntry.Identity = Guid.NewGuid();
newEntry.FirstUsedLogicalBlock = start;
newEntry.LastUsedLogicalBlock = end;
newEntry.Attributes = 0;
newEntry.Name = "Data Partition";
newEntry.WriteTo(_entryBuffer, offset);
// Commit changes to disk
Write();
return(GetEntryIndex(newEntry.Identity));
}
private GptEntry CreateEntry(long startSector, long endSector, Guid type, long attributes, string name)
{
if (endSector < startSector)
{
throw new ArgumentException("The end sector is before the start sector");
}
int offset = GetFreeEntryOffset();
GptEntry newEntry = new GptEntry();
newEntry.PartitionType = type;
newEntry.Identity = Guid.NewGuid();
newEntry.FirstUsedLogicalBlock = startSector;
newEntry.LastUsedLogicalBlock = endSector;
newEntry.Attributes = (ulong)attributes;
newEntry.Name = name;
newEntry.WriteTo(_entryBuffer, offset);
// Commit changes to disk
Write();
return(newEntry);
}
