Various devices cables and adapters schematics
Cable wiring diagram for USB cables used on some portable HDD cases.

Enclosure Pin

Enclosure Pin
Direction Host Pin
Host Pin
VCC 5 --- 4 VCC +5v Power
D- 4 <--> 3 D- Data -
D+ 3 <--> 2 D+ Data +
GND 1 --- 1 GND Ground

This odd connector is used on some cheaper USB HDD enclosures. It's similar to the SIL connectors used for headers. The numbering may be reversed to what you have for USB; I arbitrarily numbered the pins.  


5 pin USB HDD case proprietary of USB 2.0 Disk connector cable connector layout
5 pin USB HDD case proprietary connector
at the disk drive board
4 pin USB A receptacle connector layout
4 pin USB A receptacle connector
at the computer
According to 4 reports in our database (3 positive and 0 negative) this pinout should be correct.

Is this pinout
USB 2.0 Disk connector cable visual pinout:
USB 2.0 Disk connector cable diagram
click to enlarge
Source(s) of this and additional information:,
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