Will Windows Always Identify My Boot Drive as C:?

April 26, 2025 4 answers
Asked by TechNinja27
I have two identical SSDs installed in my ASUS ROG Strix Z890-F motherboard, one in the M2_1 slot and the other in the M2_2 slot. Currently, Windows 11 is installed on the SSD in the M2_2 slot, as the one in M2_1 wasn't recognized. I'm thinking of relocating the M2_2 SSD to the M2_1 slot to see if it gets recognized there. My main concern is: if I plug the SSD from M2_2 into M2_1 and set it as the boot drive, will it still be designated as the C: drive if it's recognized? Thanks for any insights!

Answers

VintagePCFan
Haha, I can relate! Back when the A: drive was all you had, having dual floppies felt so advanced. I remember those days of 5.25" floppies and cassette tapes!
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GamerGuy123
No worries about that! The drive letter is assigned by Windows based on the OS, not the physical slot. As long as the SSD is recognized, it will still be your C: drive after you move it around. Just double-check your motherboard manual for any M.2 slot configurations that might affect recognition.

SSDExplorer32: Good point! I checked my manual and didn't see anything about lane sharing either, but it's good to keep that in mind.

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DriveDoctor45
You're spot on! Windows typically assigns C: to the main OS drive unless you've made unusual modifications to the setup. Historically, A: and B: were for floppy drives, and C: became the standard for the OS.
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MemoryMaverick
Exactly! Windows consistently labels the boot drive as C: regardless of where itโ€™s plugged in. As long as the OS is on that drive, itโ€™ll hold onto the C: designation without any issues.
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