/// <summary>
/// Initializes a new instance of the BiosPartitionedDiskBuilder class.
/// </summary>
/// <param name="capacity">The capacity of the disk (in bytes)</param>
/// <param name="biosGeometry">The BIOS geometry of the disk</param>
public BiosPartitionedDiskBuilder(long capacity, Geometry biosGeometry)
{
_capacity = capacity;
_biosGeometry = biosGeometry;
_bootSectors = new SparseMemoryStream();
_bootSectors.SetLength(capacity);
_partitionTable = BiosPartitionTable.Initialize(_bootSectors, _biosGeometry);
_partitionContents = new Dictionary <int, BuilderExtent>();
}
/// <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);
// 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);
return(new GuidPartitionTable(disk, diskGeometry));
}