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I copied the data from a smaller hard disk volume to a larger one and now it takes up more space
Explanation: You put a new hard disk in your system and transferred the information from your older, smaller hard disk to the new one, only to find that the same files are taking up significantly more room.
Diagnosis: The usual cause of this problem is that the larger disk is using a larger cluster size. Under the FAT file system only whole clusters can be assigned to a file, so the larger the cluster size, the more space that is wasted; this is called slack. If you have 3,000 files taking up 300 MB of space on a 340 MB hard disk, then on average, 12 MB of that is wasted space due to the cluster size. Transferring that same data to a new 1 GB hard disk (partitioned in a single volume) will cause the same files to take up about 312 MB of space because the cluster size on the new disk will be 16 KB instead of 8KB.