IBM 5150/5155/5160  -  Some possible causes of the 1701 error

The 1701 error is generated by the BIOS expansion ROM on an XT-class hard disk controller.
Therefore, the controller's user manual is the authoritative source for information as to why the controller generated the 1701 error.
Some possibilities follow.

• Hard disk controller:  Not seated correctly in slot.
• Hard disk controller:  Edge connector contacts are dirty.
• Hard disk controller:  Sitting in slot #8 of an IBM 5155 or IBM 5160.  (Few cards work in 5155/5160 slot #8.)
• Hard disk controller:  Partially defective.
• Hard disk controller:  A new hard disk controller has been added to the 'system', but the new controller does not recognise the particular low level format on the platters of the existing hard drive.

• Hard drive:  Not powered properly.  Verify that both +5V and +12V are getting to the hard drive (ideally, making the measurement on the drive).
• Hard drive:  Not jumpered properly.
• Hard drive:  Not terminated properly.
• Hard drive:  Defective.
• Hard drive:  A new hard disk has been added to the 'system', but the hard disk controller does not recognise the particular low level format on the platters of the hard drive.

• Cabling:  Not connected properly.  (Diagrams at here.)
• Cabling:  Defective.
• Cabling:  A twisted control cable is in use, but the wrong type - see here.

• Motherboard:  Edge connector contacts in slot are dirty/damaged.  (Try a different slot.)








The green spacecraft below is another known source of 1701 errors:

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