The FIle Size increase when I transfered to another external...why?

I just bought a new external hard drive to replace my old external. After copying all my folders and what not to the new hard drive, i noticed that some of the file sizes weren't the same as before. Yet everything looks like it copied correctly.
Example:
Video folder on old HD = 5.6 GB
Video folder on new HD = 10 GB
Is there a logical reason for this and should I be concerned?

I believe that your issue is because the block (cluster) size on the disks is vastly different. Blocks are essentially the smallest amount of disk space that can be allocated to hold a file and a file takes up a least one block. If the file is bigger than the block size by even a single byte, it spills over and occupies a second block, even if it doesn't use the full second block. Thus, you get wasted space when the file size isn't exactly the same as a multiple of the block size.
For a FAT32 formatted disc, your default block/cluster size is either 16KB or 32KB, but for Mac OS Extended, it's 4KB. So, you're going to waste quite a bit more space on the FAT32 drive because its default cluster size is quite a bit larger than the equivalent on Mac OS Extended.
Message was edited by: Steve Boultbee

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