[PROBLEM]
If you have a harddisk with a connector for an external LED, it sometimes does NOT have the + pin labeled.
In most cases these pins are part of a jumper row, where one line of pins are soldered to Vcc. The HDD LED pin on this row is very likely to be the + one.
Here are some drives where this is the case:
- MAJ3182MP (Fujitsu Siemens)