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[kthxlolu]

I just recently had to recover about 150 gigs from my external, it was acting very spotty with a Firewire 400 connection (now using USB 2.0 and it's working like a charm, no crashes or anything for a week straight). Anyways, after recovering a majority of my music and whatnot, I noticed that the HDD has ~45 gb left on it. My natural assumption is that this is due to the old files remaining on the harddrive, completely "hidden" from any kind of view yet still taking up space I need to fill. The "hiding" of the files that were originally on the HDD (which were recovered) came to light after a LONG defrag/chkdsk on my external (it was crashing 5+ times/day for months due to a poor connection). After I ran chkdsk and defragged, the folder containing all my data just disappeared but was still taking up space. So I got a program, Zero Assumption Recovery, and was able to recover about 60% of my data (no huge loss - a lot of it was junk anyway).

So tl;dr is there a program that will allow me to view and delete the RAW data [sectors] on my external so I can free up space? Preferably in a somewhat automated/easy to use format, I don't want to spend hours doing this but will if I have to.

So you have an idea of what I'm looking at, here is a screen grab (the ZAR stuff is old, when I first "lost" the data, I haven't run it again):
http://img.photobucket.com/albums/v165/Thargelion/51508.jpg

Ideally, I want to do a final re-check and delete, folder by folder, what is missing so I can safely see what I am missing and what I have.

Physically the harddrive is fine, I've already checked it, there is no damage to the drive.  Again, this was caused by a faulty Firewire 400 connection, so the advice of throwing the drive out is not necessary.

[MrButkus]

You can try XP's disk fix program.  I fixed mine that had bad and corrupt folders. Nothing would delete them.

Start - Run - cmd  then in the DOS box type    chkdsk (drive): /f /r

So if your external is G   chkdsk g: /f    chkdsk_g:_/f_/r

It make take HOURS, but will give you directores or files you can then delete if XP does not get rid of them automatically.