I suspect you've been caught by a little-known secret, but you can fix the problem. First, why it does not work so far.
If you go into BIOS Setup to where you set the Boot Priority Sequence, it tells you the devices you've specified with names like "WD STxxxx on SATA0", etc. - that is, the HDD name and sometimes where it is connected. Makes it easy to understand. BUT in fact the BIOS remembers them solely according to the mobo port the device is connected to. What you did was move your good boot drive to a different port so the BIOS won't know to look there. Then you "replaced it" by connecting to its original port a new drive unit (from the DVR) containing data it cannot understand, so it cannot boot from that one! But that port is still the one it is trying to boot from!
So, how to fix? Three steps:
1. Wipe out your old boot sequence. Disconnect the "new" HDD from the DVR and leave the original good HDD containing your OS still connected to its NEW location. Close up and boot directly into BIOS Setup. Go to Boot Priority Sequence and set it to boot ONLY from your optical drive unit, and not even try to use any other device. Save and Exit, and it will try to boot from there. It will fail, and give you a message to insert a valid boot disk into the drive. Shut down.
2. Tell it where the GOOD HDD is. Boot directly into BIOS Setup again and go to Boot Priority Sequence. Now set it to try the optical drive first, and THEN the good HDD next. Save and Exit. It should boot up just fine, the way it always did. Set this way, the system will always try the optical drive first and MOST times you will NOT have a bootable disk in there, so it will quickly skip on to the good HDD and boot from that successfully. On a rare occasion you may actually want to boot from an optical disk, and so you can place it in that drive and boot from it.
3. Get the other HDD (formerly from DVR) working. Shut down and connect it back to the port you want it on. Boot directly into BIOS Setup and check that the BIOS "sees" it. Go to Boot Priority Sequence and make sure that unit is NOT anywhere in the list of boot devices. If you have changed anything, Save and Exit; otherwise for no changes, just Exit without saving.
Now your machine should boot properly from your original boot HDD, and the "new" HDD should be installed and working in hardware terms. However, it is quite likely its data content is not something Windows can understand. So, if it does NOT show up in My Computer as a drive with useful files, your best path probably is to use Disk Management to Delete any and all Partitions on it, then Create and Format a new Primary Partition which does NOT have to be bootable. IMPORTANT: doing this will wipe out ALL old data on the drive. So, if there is data you are trying to recover from it, do NOT do this Delete-and-Create sequence!!
Facebook
Twitter
Instagram