For secondary internal drives or external USB drives, Windows 10 provides the Disk Management utility, the safest and most precise tool for reformatting. To access it, right-click the Start button or press Windows + X and select “Disk Management.” This utility displays a graphical representation of all connected drives, their partitions, and file systems. Carefully identify the drive to be reformatted—double-checking its size and label to avoid accidentally erasing the wrong drive. Once identified, right-click the drive’s volume and select “Format.” A dialog box will appear, asking for file system and allocation unit size. For most modern Windows 10 uses, NTFS (New Technology File System) is the best choice because it supports large file sizes and advanced security features. For external drives intended to work with older devices or media players, exFAT or FAT32 may be preferable. Ensure “Perform a quick format” is checked unless the drive has physical errors (in which case unchecking it will perform a full scan, though this takes several hours). Click OK, then confirm the warning that all data will be lost.
Are you formatting an or an external backup drive ? Knowing the drive type can help determine if you should change any advanced allocation settings.
An older format. Limited to 4GB per file. Best for small USB sticks used on older devices (like car stereos or printers). reformat hard drive windows 10
Finally, after confirming the format, Windows 10 will execute the operation. A quick format typically completes in under a minute, erasing the file system table but not overwriting actual data. A full format (unchecking quick format) writes zeros to every sector, which securely erases data but can take several hours depending on drive capacity. Once finished, the drive will appear empty and ready for new data, with a clean NTFS or exFAT structure. To verify success, open File Explorer, right-click the reformatted drive, select “Properties,” and confirm that “Used space” is near zero and the file system matches your selection.
Type list disk to see all connected drives. Identify which number corresponds to your drive (e.g., Disk 1). For secondary internal drives or external USB drives,
Reformatting a drive deletes every single file on it. Before proceeding, ensure you have backed up any important photos, documents, or games to an external drive or cloud storage (like OneDrive or Google Drive). Once the format starts, there is usually no turning back. Method 1: Using File Explorer (Quickest Way)
Right-click the specific (the colored bar) on that drive and select Format . Once identified, right-click the drive’s volume and select
Find the drive in the list or the visual block diagram at the bottom.
Use this method if you are selling the computer, recycling it, or starting over with a fresh copy of Windows 10. You cannot format the C: drive while Windows is running from it.