Well, first download WinMFS or MFS Live from here
. Then pull the hard drive and install it in a machine running an appropriate operating system (MFS Live has the OS on the bootable disk). Use the utilities to see if the drive is completely dead, or can be copied to another drive. If it is dead, go to DVRupgrade
and either get a TiVo drive for your unit or get Instant Cake for your unit and apply it to a regular hard drive. Since you say you have the Maxtor, you probably want Instant Cake. Then use MFS Live or WinMFS to marry the external drive to the internal. As long as the PC you use for the upgrade has available SATA ports, it pretty painless. If not, you'll need a USB => SATA adapter.