I have an old laptop (Acer Aspire 5749) that I wanted to upgrade from an HDD to an SSD. Because I have plenty stuff where I will have to find my license keys or installation media, I wanted to use the old windows installation for those software, which I haven't migrated to the SSD already.

I installed Windows 10 on the SSD and put the HDD into an USB to SATA enclosure. The SSD works fine but I cannot boot form the previously internal HDD any more.

I get the sad BSOD with the error: INACCESSIBLE BOOT DEVICE

Is there a way to make the laptop start form the externalized HDD? Otherwise I will have to swap it back into my laptop and postpone the SSD upgrade until I find all the things I need to install.

Thanks in advance.

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  • Windows was never designed to boot from usb unless it is a Windows To Go installation.
    – Moab
    Dec 16 '18 at 20:05

You should put the SSD in the enclosure and boot from the HDD, then use one of the following free tools to clone the HDD to the SSD:

Once you have cloned the HDD to the SDD, put the SDD into the computer and boot.

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