private void CalcPositionDiskToVirtual(int start, int diskId, out int ret)
{
ret = -1;
int repeatSizeOnDisk = NumDiscs * ChunkSize;
int dataSizeOnDisk = (NumDiscs - 1) * ChunkSize;
int offsetInChunk = start % ChunkSize;
int chunkAdressOnDisk = start - offsetInChunk; // pos in %ChunkSize
int chunkOffsetOnDisk = chunkAdressOnDisk % repeatSizeOnDisk;
int basePosOnDisk = chunkAdressOnDisk - chunkOffsetOnDisk;
int basePos = basePosOnDisk / repeatSizeOnDisk * dataSizeOnDisk * NumDiscs;
int inTablePos = DiskPositions[diskId] + NumDiscs * (chunkOffsetOnDisk / ChunkSize);
if (Arrangement.Where(o => o.Value == inTablePos).Select(o => o.Key).Any())
{
int otherPos = Arrangement.Where(o => o.Value == inTablePos).Select(o => o.Key).First();
ret = basePos + otherPos * ChunkSize + offsetInChunk;
}
}
