/// <summary>
/// Creates a new partition table on a disk.
/// </summary>
/// <param name="disk">The stream containing the disk data.</param>
/// <param name="diskGeometry">The geometry of the disk.</param>
/// <returns>An object to access the newly created partition table.</returns>
public static GuidPartitionTable Initialize(Stream disk, Geometry diskGeometry)
{
// Create the protective MBR partition record.
BiosPartitionTable pt = BiosPartitionTable.Initialize(disk, diskGeometry);
pt.CreatePrimaryByCylinder(0, diskGeometry.Cylinders - 1, BiosPartitionTypes.GptProtective, false);
// Create the GPT headers, and blank-out the entry areas
const int EntryCount = 128;
const int EntrySize = 128;
int entrySectors = (EntryCount * EntrySize + diskGeometry.BytesPerSector - 1) / diskGeometry.BytesPerSector;
byte[] entriesBuffer = new byte[EntryCount * EntrySize];
// Prepare primary header
GptHeader header = new GptHeader(diskGeometry.BytesPerSector);
header.HeaderLba = 1;
header.AlternateHeaderLba = disk.Length / diskGeometry.BytesPerSector - 1;
header.FirstUsable = header.HeaderLba + entrySectors + 1;
header.LastUsable = header.AlternateHeaderLba - entrySectors - 1;
header.DiskGuid = Guid.NewGuid();
header.PartitionEntriesLba = 2;
header.PartitionEntryCount = EntryCount;
header.PartitionEntrySize = EntrySize;
header.EntriesCrc = CalcEntriesCrc(entriesBuffer);
// Write the primary header
byte[] headerBuffer = new byte[diskGeometry.BytesPerSector];
header.WriteTo(headerBuffer, 0);
disk.Position = header.HeaderLba * diskGeometry.BytesPerSector;
disk.Write(headerBuffer, 0, headerBuffer.Length);
// Write the primary partition table
disk.Position = header.PartitionEntriesLba * diskGeometry.BytesPerSector;
disk.Write(entriesBuffer, 0, entriesBuffer.Length);
// Calc alternate header
header.HeaderLba = header.AlternateHeaderLba;
header.AlternateHeaderLba = 1;
header.PartitionEntriesLba = header.HeaderLba - entrySectors;
// Write the alternate header
header.WriteTo(headerBuffer, 0);
disk.Position = header.HeaderLba * diskGeometry.BytesPerSector;
disk.Write(headerBuffer, 0, headerBuffer.Length);
// Write the alternate partition table
disk.Position = header.PartitionEntriesLba * diskGeometry.BytesPerSector;
disk.Write(entriesBuffer, 0, entriesBuffer.Length);
return(new GuidPartitionTable(disk, diskGeometry));
}
private void WriteSecondaryHeader()
{
byte[] buffer = new byte[_diskGeometry.BytesPerSector];
_secondaryHeader.EntriesCrc = CalcEntriesCrc();
_secondaryHeader.WriteTo(buffer, 0);
_diskData.Position = _diskData.Length - _diskGeometry.BytesPerSector;
_diskData.Write(buffer, 0, buffer.Length);
_diskData.Position = _secondaryHeader.PartitionEntriesLba * _diskGeometry.BytesPerSector;
_diskData.Write(_entryBuffer, 0, _entryBuffer.Length);
}
private void WritePrimaryHeader()
{
byte[] buffer = new byte[_diskGeometry.BytesPerSector];
_primaryHeader.EntriesCrc = CalcEntriesCrc();
_primaryHeader.WriteTo(buffer, 0);
_diskData.Position = _diskGeometry.BytesPerSector;
_diskData.Write(buffer, 0, buffer.Length);
_diskData.Position = 2 * _diskGeometry.BytesPerSector;
_diskData.Write(_entryBuffer, 0, _entryBuffer.Length);
}
