rem: return SetTo(fVolume->ToBlock(run), empty);
add: Unset(); fBlockNumber = block; return fBlock = empty ? (uint8 *)get_empty_block(fVolume->Device(), block, BlockSize()) : (uint8 *)get_block(fVolume->Device(), block, BlockSize());
context: CachedBlock::SetTo(block_run run, bool empty){	return SetTo(fVolume->ToBlock(run), empty);}