We had a SATA3 drive that was performing poorly and making noise, and installed Windows 7 onto a new drive. The install went well, but left the bootloader on the old drive, and so I could not remove it; Windows treated it as a multi-boot system with a new boot option on the new disk. Everything worked, so I figured I'd have time to fix it. Well, the old drive died a few weeks later and now I have no idea how to address this.

How can I instruct the PC to boot to the new disk, when there isn't a bootloader present on it? Do I need to reinstall Windows from scratch? From looking at the board specs, it supports UEFI, I am unsure if this is relevant.


EDIT: I've been able to get the original boot drive running. That drive has a 100MB EFI partition, can I simply resize the new disk to add a new partition at the beginning of the drive, and copy it there?

  • Reinstall windows with the old drive disconnected. – Moab Jan 23 '19 at 21:45
  • I think you can install the bootloader onto the new drive booting from an external DVD/ISO. – Manuel Florian Jan 23 '19 at 21:53
  • If I reinstall Windows with the old drive disconnected, will it update the bootloader only or will it completely reinstall the OS (Programs etc.)? – mikewaters Jan 23 '19 at 22:11
  • Boot from external USB/DVD, go to command line and then use bcdboot command to recreate boot files. See here for example tweakhound.com/2012/11/13/how-to-fix-the-windows-bootloader – lx07 Jan 26 '19 at 16:39
  • @mikewaters You ever connect to my chat room link? Read over answers here: superuser.com/questions/965751/… about getting the detail from that partition since you can access the drive that contains it. See how it's pointing to the volumes, etc. in it's configs. – Pillsbury IT Doughboy Jan 29 '19 at 16:34
  1. Boot from your Win7 installation media
  2. Choose Windows 7 Setup Language and Other Settings
  3. Click on the Repair Your Computer Link
  4. Choose Your Windows 7 Installation
  5. Choose the Startup Repair Recovery Tool

This process should locate your installation and make a new Windows boot loader that points to it.

SOURCE: https://www.lifewire.com/how-to-perform-a-startup-repair-in-windows-7-2626170

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