/// <summary>
/// Creates a new primary partition with a target size.
/// </summary>
/// <param name="size">The target size (in bytes).</param>
/// <param name="type">The partition type.</param>
/// <param name="active">Whether the partition is active (bootable).</param>
/// <returns>The index of the new partition.</returns>
public override int Create(long size, WellKnownPartitionType type, bool active)
{
if (size < _diskGeometry.BytesPerSector)
{
throw new ArgumentOutOfRangeException(nameof(size), size, "size must be at least one sector");
}
long sectorLength = size / _diskGeometry.BytesPerSector;
long start = FindGap(size / _diskGeometry.BytesPerSector, 1);
return(Create(start, start + sectorLength - 1, GuidPartitionTypes.Convert(type), 0, "Data Partition"));
}
/// <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());
EstablishReservedPartition(allEntries);
// Fill the rest of the disk with the requested partition
long start = FirstAvailableSector(allEntries);
long end = FindLastFreeSector(start, allEntries);
return(Create(start, end, GuidPartitionTypes.Convert(type), 0, "Data Partition"));
}
/// <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));
}
/// <summary>
/// Creates a new aligned partition with a target size.
/// </summary>
/// <param name="size">The target size (in bytes).</param>
/// <param name="type">The partition type.</param>
/// <param name="active">Whether the partition is active (bootable).</param>
/// <param name="alignment">The alignment (in bytes).</param>
/// <returns>The index of the new partition.</returns>
/// <remarks>
/// Traditionally partitions were aligned to the physical structure of the underlying disk,
/// however with modern storage greater efficiency is achieved by aligning partitions on
/// large values that are a power of two.
/// </remarks>
public override int CreateAligned(long size, WellKnownPartitionType type, bool active, int alignment)
{
if (size < _diskGeometry.BytesPerSector)
{
throw new ArgumentOutOfRangeException(nameof(size), size, "size must be at least one sector");
}
if (alignment % _diskGeometry.BytesPerSector != 0)
{
throw new ArgumentException("Alignment is not a multiple of the sector size");
}
if (size % alignment != 0)
{
throw new ArgumentException("Size is not a multiple of the alignment");
}
long sectorLength = size / _diskGeometry.BytesPerSector;
long start = FindGap(size / _diskGeometry.BytesPerSector, alignment / _diskGeometry.BytesPerSector);
return(Create(start, start + sectorLength - 1, GuidPartitionTypes.Convert(type), 0, "Data Partition"));
}
/// <summary>
/// Creates a new aligned partition that encompasses the entire disk.
/// </summary>
/// <param name="type">The partition type</param>
/// <param name="active">Whether the partition is active (bootable)</param>
/// <param name="alignment">The alignment (in bytes)</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>
/// <remarks>
/// Traditionally partitions were aligned to the physical structure of the underlying disk,
/// however with modern storage greater efficiency is acheived by aligning partitions on
/// large values that are a power of two.
/// </remarks>
public override int CreateAligned(WellKnownPartitionType type, bool active, int alignment)
{
if (alignment % _diskGeometry.BytesPerSector != 0)
{
throw new ArgumentException("Alignment is not a multiple of the sector size");
}
List <GptEntry> allEntries = new List <GptEntry>(GetAllEntries());
EstablishReservedPartition(allEntries);
// Fill the rest of the disk with the requested partition
long start = Utilities.RoundUp(FirstAvailableSector(allEntries), alignment / _diskGeometry.BytesPerSector);
long end = Utilities.RoundDown(FindLastFreeSector(start, allEntries) + 1, alignment / _diskGeometry.BytesPerSector);
if (end <= start)
{
throw new IOException("No available space");
}
return(Create(start, end - 1, GuidPartitionTypes.Convert(type), 0, "Data Partition"));
}
