In situations where you want to be able to check a hard drive but can't boot to Windows, WD used to provide an ISO for a bootable CD that included its DLG for DOS diagnostic.
Some time ago, WD removed the ISO and now only provides DLG for DOS as a zip file (dlgdiag_5_20.zip) that must be copied to a bootable floppy disk -- but who has floppy drives anymore!
Although there are a bunch of bootable CD ISOs on the Internet, and some even are modifiable to let you add your own utilities (like DLGDIAG), all of them that I've been able to find use OAKCDROM.SYS as the driver for the CDROM device. Although the disks boot up OK, that driver doesn't recognize a CDROM connected via SATA ... so the DLGDIAG utility isn't usable.
Can anyone tell me how to build a bootable CD that will (1) allow me to copy DLGDIAG.EXE into the ISO and (2) will recognize a SATA-connected CD or DVD drive after bootup so that DLGDIAG can be run?
If the above ideas are impossible, what do people suggest for diagnosing WD hard drive problems when the system won't boot into Windows?
Go here --> http://www.hirensbootcd.org/hbcd-v152/
Download the zip file, extract the ISO file, and burn it. If you have Windows 7, just right-click and select "Burn disc image." Otherwise download ImgBurn and use that to burn the ISO.