WD1007V-MC1 ESDI Adapter

@DDFF.ADF IBM ESDI Fixed Disk Controller (IBM version)
@DDFF.ADF IBM ESDI Fixed Disk Controller (Phoenix/NCR, rename to @DDFF.ADF)

LL7FMT.zip WD1007V-MC1 low-level format utility

ESDI Integration and Setup - Western Digital (by Wolfgang Gehl)
ESDI Resources - Western Digital (by Wolfgang Gehl)

WD1007V-MC1 ESDI Adapter
BIOS and Microcode
Drive Format

Adapter photos provided by Stefan Lemanski.

WD1007V-MC1 ESDI Adapter [P] [P]

CR1 Activity LED?
J1 Pads for 4-pin header (act. LED?)
J2 20-pin drive 0 data connector
J3 20-pin drive 1 data connector
J4 34-pin control connector (both drives)
U1 Intel N80C188
U3 µcode ROM 62-000193-040?
U7 SRM2264LM-10 8Kx8 SRAM
U10 WDC WD14C03-JT
U13 Sony CXK58257M-10L 32Kx8 SRAM
U29 BIOS ROM 62-000325-030
U30 BIOS ROM 62-000321-030?
Y1 NYMPH 33-03 xtal
Y2 3314T8J? xtal

Supported Data Rates: 10, 15 MHz

The displayed sample has no background bracket. In its place is a short springy contact not much longer than the blue plastic tab used for card installation/removal. This is because the adapter was shipped as an internal ESDI controller with the French Bull Micral 500 system.

BIOS and Microcode

Images not available yet.


There are no user-configurable jumpers on the WD1007V-MC1, all configuration is done through the firmware. Each WD1007V-MC1 board can support two hard disks. If two WD1007V-MC1 boards are installed in a PS/2 system only one drive may be attached to each controller. (i.e.: you can never have more than a maximum of two hard drives in a PS/2 system, no matter how many controller cards are installed.) The ESDI drive is always assigned to C:. If you have one ESDI and one ST506/412 drive, the MCA architecture always selects the ESDI drive as drive C:.

Drive Format (from Wolfgang Gehl, original HERE)

The WD1007V-MC1 is a Micro Channel ESDI controller, which requires hard sectored drives with 36 sectors per track for the 10 MHz drives and 53 sectors per track for the 15 MHz drives. All setup is done with Western Digital's 'll7fmt.exe' utility. 'llformat.exe' does defect mapping by default and leaves you with an error free drive after low-level format. Defect management and interleave setting is handled without user intervention.

Unfortunately it is not possible to read the hard disk contents with another ESDI controller card, not even with a WD1007x ISA ESDI controller.

Content created and/or collected by:
Louis Ohland, Peter Wendt, David Beem, William Walsh, Tatsuo Sunagawa, Jim Shorney, Tim Clarke, Kevin Bowling, Tomáš Slavotínek, and many others.

Ardent Tool of Capitalism - MAD Edition! is maintained by Tomáš Slavotínek.
Last update: 25 Jun 2022 - Changes & Credits | Legal Info & Contact