IBM WDI-325Q 20MB Hard Drive

This is a circa 1987-1988 proprietary Hard Drive, manufactured by IBM Japan. Most often found in the IBM PS/2 Model 25 and 30.

"The PS/2 Model 25, 25-286, 30, and 30-286 used an 8-bit pseudo-IDE hard drive interface at 3:1 interleave. Both power and data I/O are provided to the drive through a single card-edge connector."

For more information, see this article's corresponding Wikipedia page: Device.

Preliminary Information
Leak Risk	High
Batteries	None
Destructive Entry	No

Disassembly Notes

Four Phillips screws.

Original Parts

Controller Board – 6127880 – A07188

WDI-325Q Front

Capacitor Specifications and Footprint Information

RefDes	Qty	Capacitance	Voltage	Mount	Diameter/Size	Height	Lead Spacing	Temp	Type	Brand	Series	Notes
C2, C9	2	47 µF	16	Through Hole	6mm	6mm	5mm	105 °C	Electrolytic
C3, C4, C5, C6, C12	5	6.8 µF	16	Through Hole	4mm	6mm	5mm	105 °C	Electrolytic			C3 is unmarked
C7, C10, C11, C13	4	10 µF	16	Through Hole	4mm	6mm	5mm	105 °C	Electrolytic
C8, C14	2	4.7 µF	16	Through Hole	4mm	6mm	5mm	105 °C	Electrolytic
C1	1	100 µF	6.3	Through Hole	6mm	6mm	5mm	105 °C	Electrolytic

WDI-325Q Back

Replacement Parts

Basic PCB Name

Capacitors

RefDes	Qty	Compatible Part Number	Order Links
			Digikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.