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GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Member 798912221-May-18 12:35
MemberMember 798912221-May-18 12:35 
GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Randor 20-May-18 12:05
professional Randor 20-May-18 12:05 
GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Daniel Pfeffer20-May-18 18:37
professionalDaniel Pfeffer20-May-18 18:37 
GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Randor 20-May-18 20:56
professional Randor 20-May-18 20:56 
GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Daniel Pfeffer20-May-18 21:29
professionalDaniel Pfeffer20-May-18 21:29 
GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Member 798912221-May-18 11:44
MemberMember 798912221-May-18 11:44 
GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Randor 21-May-18 13:05
professional Randor 21-May-18 13:05 
GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Member 798912221-May-18 12:30
MemberMember 798912221-May-18 12:30 
Daniel Pfeffer wrote:
Lastly, your old disk may have unused areas within the meta data files - over time, files were deleted, created, and some of the meta data area was left unused. When copying the files to a new disk, any such gaps are eliminated.
That wouldn't afect the "Size on disk" for each file, though.

If you copy to an identically sized disk, it might give you more free space on the disk - but usually not from a better packed MFT! The MFT, with the metadata, is allocated as one huge chunk when the disk is formatted. For identical disks (and using default formatting parameters) they should be the same size. The cleanup gathers the that used records within that file at the start, unused records at the end, but the MFT file has the same file. Only if you at one time have had an excessive number of files on the old disk, so that the MFT had to be extended, may the new disk get away with the orignal MFT size, before it was extended.

There are, however, several other files that normally won't be copied over to the new disk, such as the recycle bin, maybe not the indexing data if your original file was indexed, desktop.ini files (holding icons used by the Explorer) and several other hidden/system files. You may actually loose some data, too, without noticing: Some files may have alternate data streams, and the copyuing method determines if they are preserved. If you go via a FAT disk, they are surely NOT preserved. (On the other hand: Alternate streams are rarely used, and when they are, it is often supplementary data you can do without. It is not as it was on the original Mac OS, before they went Unix, where "file forks" were in common use - forks and alternate streams are similar.) If you copy via FAT, such as by a memory stick, you will also loose any extended metadata - but only in exceptional cases will that save you any disk space when copying the files from the memory stick to then new NTFS disk.

If there old disks had a lot of hidden files, was indexed, and the waste basket was full, then your new disk may have hundred of megabytes of more free space. But each individual file will have the same on-disk size as long as the allocation size is the same.
GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Daniel Pfeffer21-May-18 20:15
professionalDaniel Pfeffer21-May-18 20:15 
GeneralRe: Should I be concerned if "Size on disk" for directory is different on C: than on external drive? Pin
Member 798912221-May-18 11:57
MemberMember 798912221-May-18 11:57 
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