Gidday W2k will recognise 2 terrabyte drives so the size of the drive shouldn't be a problem. "inaccessable boot device" error can be that the system is looking for a scsi devise at boot up take a look at Technet Q119467 and search Technet for the info on boot.ini infomation errors w2k sometimes detects a scsi devise and then will try to boot from it and the settings need to be manually modified before the system will boot w2k hope this helps some Bob Stout -----Original Message----- Sorry folks, wrong subject line on previous post. Greetings All: A co-worker of mine is experience a problem which I've quoted below. I've suggested to him that he try making his older & smaller drive as his master boot device, and that if this works he will need to disable ultra66 support for his new drive. I vaguely remember a recent post suggesting something similar. If I was incorrect or of anyone has any other advice to offer, please post. His problem is as follows: >I upgraded to a pIII 500 on a P3B 6 pci 1 isa motherboard, i have 256 meg of< >ram and everything works sweet in 98 se, when i run windows 2000 install< >it installs fine i can configure it. but if i reboot it never fails i get the< >stop error " Inaccessible boot device" i've already tried removing all my< >drives except my main drive and also samething with cards except video, same< >thing, i've reinstalled countless times with the same error, i've also made< >various changes to settings in the bios and nothing, same error. I also have< >in my machine a 40 GB which is my master and a 17GB which is slaved, i have a< >dvd encore 2x as my main cdrom and a HI-val 2x rewritable burner slaved to< >that. Ian Carmichael The PCBUILD web site always needs good submissions. If you would like to contribute to the website, send any hardware tech tips or hardware reviews to: [log in to unmask]