The drive is now initialized but still shows as "Unallocated." You must create a partition and format it.
Installation and Configuration of a New Internal Hard Drive in a Windows 10 Environment
Windows will not see a brand-new drive in File Explorer until it has been "initialized" and formatted. How to Install a Hard Drive or SSD in a PC how to install new hard drive windows 10
System Administrator Guide Date: April 14, 2026
Once the drive is physically installed and the computer is turned on, Windows 10 might not show the drive immediately. You need to "initialize" it. The drive is now initialized but still shows as "Unallocated
| Issue | Likely Cause | Resolution | | :--- | :--- | :--- | | Drive not seen in BIOS | Loose data/power cable | Reseat cables, try different SATA port | | Drive not seen in Disk Management | Not initialized | Rescan disks from Disk Management's Action menu | | Cannot format drive | Drive has offline status | Right-click disk label in Disk Management and select "Online" |
: Slide the new hard drive into an available 3.5-inch bay. Secure it using screws on both sides to prevent vibration. You need to "initialize" it
Open File Explorer ( Win + E ). The new drive should appear under "This PC" with the assigned letter and full capacity listed.