hi, i recently bought and installed a new internal harddrive. using my old drive and its win7 installation i downloaded my digital copy of win7 and its installer and used that installer to do a fresh win7 install on the new drive. once that was done my old drive still had boot priority but during boot i was given the option to boot to either OS, depending on the drive. that all works fine as-is: i can boot to my new install, which is where i'm posting this from, and i can boot to my old install with no problems. the only problem comes in when i change boot priority in the bios.
when the old drive isn't the boot drive, or when it's disconnected altogether, the bios can't detect an OS on the new drive. how would this happen? is the new install's MBR partitioned into the old drive? i've looked into running win7's repair tool and bootrec.exe, since i have a spare burn of my digital win7 lying around (that i only avoided using for the original install because my dvd drive is old and flaky), but haven't done it. what are my options? i'd format and reinstall but i'm worried of it happening a second time and i spent yesterday installing and setting up firefox and steam and enough stuff that i'd like to avoid that if possible. i'll do it if i have to, of course, but i'd really appreciate some advice.
and sorry about the typo in the title
Edited by freegilligan, 12 January 2014 - 09:20 AM.