Hi, new here, just bought TI home 2009 hoping for a simple backup program .. oh boy! My basic problem, like so many, is validation failures on large backups - Disk Backups, File backup validates ok. After readng all the posts I see i need to do a Memtest of my 4G. Which i will do shorty .. but my question is, how do I do a thorough CheckDisk on a large (1Tb) external NFTS drive. i can do a simple test which comes back ok but i'd like to do a deeper test. Evey time I try to run one, it says that it needs to be done at startup, asks me to reboot, I do - but no Chkdsk!! it works on my C: drive (500G) but not on my G: (backup external) drive (1T) ?? Is it the size that's the problem or the fact that it's a USB external drive? I've tried Vista's Chkdsk and TuneUp's chksk. .. hmmmm? any help? In mean time, I'll do the memory test using Memtest86 (although I've already used Windows Memory Diagnostic tool - 2 passes only, which came back ok) BTW, the Acronis website sucks big time, it looks like a EDS contraption .. strange and unfriendly! it defaulted me to a large corporations support window so when I entered my product code and then realised i should be in the Single user support page, it wouldn't re-accept my code saying it had already been entered and i couldn't get any further to ask for support!! UG!! ..gladly i found this EASY TO USE FORUM (take notes EDS .. err, ACRONIS) Another thing, the reason my validations failed was because the file size was only 147G, not the 477G the size of my C: drive - Disk Back up - sector BY sector. i think that's right? i wanted to remove all the compression al-gore-rythms. kingRemus, first king of Reme!