Transfer Problems

Impossible to say without any additional information. However first BACK IT UP!!!!! It's possible the disk may be failing or has become corrupted some how. You don't mention if this is an internal of external HD, I'm guessing external. Also it would be helpful to know the make, model and method of connection.

However if internal run Disk Utility and check it's S.M.A.R.T status, if it doesn't say Verified it's definitely in trouble and either need to be repaired or replaced.

If external also running Disk Utility run Verify Disk and Repair Disk. If you get errors in Repair Disk run it several times until either it doesn't get errors or you have determined it is damaged. If it's damaged replace it immediately.

Roger

OK run Disk Utility (Applications - Utilities - Disk Utility) as I mentioned in my first post.

What brand is the drive?

OK do you know how it's formatted? If you are using it only on the Mac it should be *Mac OS Extended (Journaled)*.

OK, so how is it formatted?

That is probably the problem. Mac's can read NTFS however they cannot write to it. You can get a utility called NTFS-3G that should help it. However if this fit's your lifestyle I'd recommend getting a separate drive for the Mac or getting a network drive so both the PC and Mac can share it.

Your welcome and good luck!

That's because without special third-party driver software, the Mac OS can *only read* NTFS-formatted volumes. It can't write to them. So you can read anything that's stored on your NTFS drive, but you can't edit and save, move, or trash anything on it, and you can't copy or save any new content onto it.

[NTFS-3G|http://www.tuxera.com/community/ntfs-3g-download> (free) or [Tuxera NTFS|http://www.tuxera.com/products/tuxera-ntfs-for-mac> (the more polished commercial version) would give you full read/write ability on any NTFS-formatted drive.