One way to use contiguous allocation of the disk and not suffer from holes is to compact the disk every time a file is removed. Since all files are contiguous, copying a file requires a seek and rotational delay to read the file, followed by the transfer at full speed. Writing the file back requires the same work. Assume you have a modern disk with an average seek time of 15 msec, operates at 7200RPM, and has a transfer rate of 6 Gbps. If the average file size is 16 KB, how long does it take to read a file into main memory and write it back to a new location? (Assume no prefetching and cold caches.) How long would it take to compact half of a 2 TB disk?