Intel BOXD850MVSE Quick Reference Manual page 21

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The Intel boxed desktop board package includes two IDE cables. Either cable
can connect two drives to the desktop board. The cables support the Ultra
DMA-33 (40-contact) or ATA-66/100 (40-contact, 80-conductor) transfer
protocols and are backward compatible with drives using slower IDE transfer
protocols.
The cable will work correctly only when oriented as shown in the figure below.
For correct cable function:
1 Observe the precautions in "Before You Begin" on page 3.
2 Attach the cable end with the single connector (A) to the board.
3 Attach the cable end with the two closely spaced connectors (B) to the
drives.
B
A
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