Windows 7: Can't read from the source file or disk.

guys, the file cannot be copied is not in the external hdd, its in my hdd #2 <-internal, so u guys think the hdd #2 is damaged, but i can copy other files smoothly.

hdd #1 = local disk C:, windows 7 installed - 250gb
hdd #2 = local disk D:, all my important files go here - 250gb

Give 'TeraCopy' a try. It handles copy/paste operations better than the in-built one.

But I thought you were trying to copy to the Ext Hard Drive. The spec of your Ext HD reads "The USB powered Prestige™ Portable Hard Drive requires no external power supply". This could be the problem as has already been suggested!

ok guys, back then there were about 3 files which cannot be copied, now it' spreading, more and more files cannot be copied from Disk D: to Disk C: or any external hard disk or flashdisk..

so, is my Disk D: infected/corrupted or something?

EDIT: it seems that i cannot remove or copy paste a file from D: to any other disk.. BUT.. i can copy paste any file INTO disk D:

Also, this is result from tera copy, as i posted, this thing is spreading, now even .rar file/s..

But is this still only happening with larger files? If it is the case that the problem is the lack of a power source to the ext HD apart from the USB then it doesn't matter what program you use to transfer your files.

ok, i just tested it now,,, only "SOME" files cannot be copied, as you can see in the pic i posted, its only 77mb file, but cannot be copied...

so i did now is tested some other files which are in D: disk, but they copied perfectly, 300mb file, 900mb file copied perfectly, and other files..

so im guessing only "PART" of the disk is corrupted?? can this be the problem?

Can't see how only part of the drive could be corrupted although I'm no expert on that.
Are you absolutely certain that this is not a permissions problem?

i think i need to buy a new hdd and replace this one, coz more and more of my files in disk D: are being corrupted.

Have you tried running chkdsk on that drive? Try chkdsk d: /r

^
i didnt use that command in cmd, but i did is right click the drive D: and check disk... look at the screenshots, these were the results, any conclusion?? i'll look at them tomorrow, coz now i gotta sleep

also, i noticed that the files which cannot be copied few days ago, turned into 0 kb files now, damn.