November 11, 2026

Windows 10 External Hard Drive Keeps Disconnecting: Keeping a USB Drive Connected During Copies and Backups

You start copying a large folder to your external hard drive, and halfway through you hear the Windows disconnect sound. The drive disappears from File Explorer, then reappears a few seconds later, and the copy fails. When a Windows 10 external hard drive keeps disconnecting, backups become unreliable and files can be damaged.

External drives need a steady data connection and steady power. Portable hard drives draw their power from the USB port, and spinning up a disk takes more power than many ports, hubs, or thin cables can supply reliably.

Windows also saves energy by turning off USB ports and drives that look idle. If the drive sleeps while a program is still using it, the connection can drop.

Most disconnections are solved by changing the cable, the slot port, or a power setting.

Possible Causes

The drive disconnects for these reasons:

• The USB port or hub cannot supply enough power.
• The cable is damaged, loose, or too long.
• USB selective suspend or drive power saving turns the drive off.
• The drive is failing, or its USB enclosure has a fault.

Front-panel ports on desktops and unpowered hubs are common sources of power problems.

Quick Fixes to Try First

Test the physical connection.

1. Connect the drive directly to a port on the back of a desktop or to another laptop port.
2. Use the original cable, or a short, good-quality replacement.
3. Avoid unpowered USB hubs and extension leads.
4. For drives with a separate power adapter, make sure it is connected firmly.
5. Copy a large file and see whether the disconnection still happens.

If the problem only appears with one port, that port or its controller is the weak link.

Advanced Steps for Stubborn Cases

Stop Windows switching the drive off.

1. In Control Panel > Power Options, select Change plan settings, then Change advanced power settings.
2. Expand USB settings and set “USB selective suspend setting” to Disabled.
3. Expand Hard disk and set “Turn off hard disk after” to 0, meaning Never, while plugged in.
4. In Device Manager, open each USB Root Hub, go to Power Management, and clear the power-saving option.
5. Update the USB and chipset drivers from the PC maker.

Check the drive’s health with the manufacturer’s tool, such as WD Dashboard or SeaTools, if the problem continues on every port.

Before You Go Further: Keep Your Files Safe

Copy important data off the drive as soon as you can if disconnections continue, since they may signal a failing disk. Always use Safely Remove Hardware before unplugging.

Conclusion

An external drive that keeps disconnecting usually lacks power or is being put to sleep. Use a direct port and good cable, disable USB selective suspend, and check the drive’s health.