My folder icons are gone

[skadd]

So basically I had many folders with their own special icon (movie collection) but after I copied all of them to another drive the icons are gone. All that's left is an "icon" file that's zero bytes.
Is there any way I could get it restored or do I have to add the icons back manualy?

[simsaladimbamba]

What format is that other drive using? I just tried copying a folder with a custom icon* from my Desktop to another HDD using HFS+ (Mac OS Extended) as format/file system and the icon stayed the same, thus my question.

* How to set an icon for an application, file or folder & restore to the original icon

[skadd]

Ah there we have it. NTFS to HFS+
Though it did work previously but through a network (gbit modem), not directly with usb like now.

Are the icons stored somewhere?

The icons were only added using a OS X btw.