Why won my Western Digital IDE drive work after a cold boot?
Due to an obscure interaction between Acorn’s IDE implementation and the Western Digital drives a problem occurs in that the computer becomes unable to find the Boot record that details the shape, format and other data of the hard drive. This results in a somewhat alarming and frustrating series of error messages that seem to indicate that the drive isn’t formatted at all. (And by extension implying that you have lost all your information stored on the drive.) Fortunately that isn’t the case. In reality your information is safe and sound on the drive and you merely need to give ADFS a helping hand in finding the boot record, after which it can carry on as normal. This BASIC program supplies dummy values to ADFS that allow it to do that.