Lost drive d help

Can you check if they still showing in device manager?

Go to Start > Control Panel > System > Hardware tab > Device Manager

if there's yellow exclamation points next to the icons that means there's some problem with the device

I would probably guess you need to reinstall the drivers, so find a CD that came with computer and from device manager manu you can right click on each drive, select properties go to driver tab and select update driver, then just point it to the CD and it should find the drivers

if you don't see the devices in device manager, that means they aren't recognized or they aren't getting power
 

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Check your Device manager to see if it's listed under disk drives, or if it has an yellow error message. Look under device status.
Or check administrative tools >computer management >disk management to see if it's there

Check IDE cable.

LAST EDIT: OUPS, sorry, haven't seen the previous post...