Second Drive Not Showing in File Explorer? Assign It a Drive Letter in Disk Management
Your second hard drive or SSD doesn’t appear in File Explorer, but Windows clearly detected the hardware.
Why: A volume needs a drive letter (like D: or E:) to show up in File Explorer. A drive can lose its letter, be set “Offline,” or — on a brand-new disk — have no partition at all. Disk Management lets you check and fix all three.
This guide is for a disk that already has data or has been initialized. If the disk is brand new and shows nothing but “Unallocated” space, you’ll create a volume in Fix 3.
Fix 1: Open Disk Management and find the drive
- Right-click the Start button and choose Disk Management. (Or press Windows + R, type diskmgmt.msc, and click OK.)
- Look at the list of disks at the bottom. Find your second drive by its size.
- Note what its volume says:
- It has a letter and a healthy volume but isn’t in File Explorer — go to Fix 2.
- The disk row is labelled Offline — right-click the disk on the left (where it says “Disk 1,” “Disk 2,” etc.) and choose Online, then check File Explorer.
- It shows only Unallocated black bar — go to Fix 3.
Fix 2: Assign or change the drive letter
If the volume is healthy but has no letter, give it one.
- In Disk Management, right-click the volume (the box showing its size and file system, e.g. NTFS) and choose Change Drive Letter and Paths.
- Click Add if there’s no letter, or Change to pick a different one.
- Choose a free letter from the drop-down (any letter not already used, such as D, E, or F) and click OK.
- Confirm any prompt. The drive now appears in File Explorer under This PC.
Fix 3: Create a volume on a new disk
A new, never-used disk has no usable space until you create a volume on it.
- If the new disk says Not Initialized, right-click the disk on the left and choose Initialize Disk. Choose GPT (recommended for modern PCs) and click OK.
- Right-click the black Unallocated area and choose New Simple Volume.
- Click Next through the wizard. Accept the full size, then either accept the default drive letter or pick your own, and let it format with NTFS.
- Click Finish. The drive is now formatted, lettered, and visible in File Explorer.
Note: creating a volume or initializing a disk erases anything on it. Only do Fix 3 on an empty drive.
FAQ
Will assigning a drive letter erase my files? No. Changing or adding a drive letter (Fix 2) leaves your data untouched. Only initializing or creating a new volume (Fix 3) erases data.
The disk isn’t listed in Disk Management at all. Then Windows doesn’t see it. Reseat the power and data cables (or reconnect the USB enclosure), try another port, and make sure the drive is enabled in your PC’s BIOS/UEFI.
Can I pick any drive letter? Any letter that isn’t already in use. Avoid A and B (reserved for floppy drives) and C (your Windows drive).