Required Device Is Not Connected? Fix the Error

Updated 8 November 2026 · Standard formula, shown below

“Required device is not connected or cannot be accessed” means Windows or an application cannot reach a device or storage location it needs. Check the connection and power first, then identify which device the message refers to; the right fix differs for a USB drive, external disk, phone, printer, or boot device.

What the message means

This wording is a general access error, not a diagnosis of one specific fault. A program may display it when it cannot find a file on removable storage, Windows may show it while starting or recovering the system, or a device-management task may fail because a drive is unavailable. The important clue is what you were doing immediately before it appeared.

“Connected” can mean more than physically plugged in. A device might have power but no data connection, be visible to Windows but not mounted with a drive letter, or be inaccessible because its file system is damaged. Network locations and virtual drives can also be unavailable even though no cable is involved.

Start with safe, basic checks

Note the context. Record the app, action, and any device or drive name shown. If the message appears before Windows loads, treat it as a startup issue rather than an app-specific problem.
Check power and connections. For an external drive, confirm its power adapter is connected if it has one. Reseat the data cable at both ends, and try another port. For a phone, use a cable that supports data transfer; some cables only charge.
Try a direct connection. Temporarily remove USB hubs, docking stations, extension cables, and adapters. A direct port helps determine whether an intermediary is causing the problem.
Restart the app or computer. Save work first. A restart can clear a temporary device or mount problem, but it will not repair failing hardware or a damaged file system.
Test another port or computer, if available. If the device works elsewhere, investigate the original computer’s port, settings, or drivers. If it fails everywhere, the device, cable, or its power supply is more likely involved.

If the device contains important files, avoid formatting it, initializing it, or repeatedly attempting repairs before considering data recovery. Those actions can make recovery harder, especially if the drive is failing.

Check whether Windows can see the device

On Windows, look for the device in File Explorer, then check Disk Management. Right-click Start and select Disk Management. A connected disk may appear there even when it has no drive letter. If it is a healthy partition without a letter, assigning an unused drive letter may make it accessible; avoid changing partitions or formatting a disk merely to make it appear.

Device Manager can help distinguish a connection issue from a storage issue. Right-click Start, open Device Manager, and inspect relevant categories such as Disk drives, Universal Serial Bus controllers, or the device’s own category. A warning symbol or missing device may point to a driver, port, or hardware problem. Disconnecting and reconnecting the device, or restarting Windows, is a sensible first step before driver changes.

Do not assume that “not in File Explorer” means the device is dead. It may lack a drive letter, be offline, use a file system Windows does not recognize, or be detected with a partition problem. Conversely, a device appearing in Device Manager does not prove its files can be read.

Common causes by device type

USB drive or external disk: Loose or damaged cable, inadequate power, a faulty port, missing drive letter, file-system errors, or hardware failure.
Phone or camera: Charge-only cable, locked screen, missing file-transfer permission, or a connection mode set to charging rather than file transfer. Unlock the device and approve any prompt it presents.
Printer or scanner: Power or network interruption, disconnected USB cable, or the computer selecting a device that is offline. Confirm the device is powered on and connected to the same intended network or port.
Network folder: The host computer or server may be offline, the network connection may have dropped, or the saved location may no longer be available. Check that the network location is reachable before changing local storage settings.
Windows startup or recovery: The system may be unable to reach a boot-related drive or recovery location. Causes can include a disconnected drive, altered firmware boot settings, or disk damage. Startup errors deserve more caution than a temporary app error.

When the error appears during startup

If Windows cannot start and names a required device, first check for recently disconnected storage or a change to connected drives. Power the computer off before reseating internal components, and do so only if you are comfortable with the hardware and can follow the computer maker’s instructions. For a laptop or sealed computer, do not force the case open.

Firmware setup screens may show whether the internal drive is detected, but menu names and controls vary by computer. Avoid changing boot mode, storage-controller settings, or security settings at random: a setting change can prevent a previously working Windows installation from starting. If the drive is absent from firmware or makes unusual sounds, stop repeated startup attempts and seek qualified repair or data-recovery help if the files matter.

If the drive is detected but Windows still fails, use Windows recovery options or installation media only when you understand the selected repair action. Back up accessible files before attempting resets or reinstallations. A reset or reinstall can remove data, depending on the option chosen.

What to avoid and when to get help

Do not format or initialize a disk simply because Windows offers that option. Formatting prepares a file system and can erase access to existing data; initialization changes disk metadata. If the drive contains the only copy of important files, disconnect it if it is making unusual noises or repeatedly disappearing, and consult a reputable data-recovery professional rather than experimenting with repair tools.

For a device that contains no important data, after checking cables and ports you can use Windows’ built-in troubleshooting and disk tools as appropriate. Keep a record of any warning, the device’s appearance in Disk Management and Device Manager, and whether it works on another computer. That evidence helps narrow down a failing device, cable, port, or Windows configuration.

Frequently Asked Questions

Does this message mean my device is broken?
No. It can result from a loose cable, missing drive letter, unavailable network location, or software problem. Testing a different cable, port, or computer can help isolate the cause.

Why can Windows detect my drive but not open it?
Detection only confirms that Windows sees some device information. The drive may lack a usable drive letter, have file-system damage, use an unsupported format, or have failing storage.

Should I format a drive that Windows says needs formatting?
Not if you need files on it. Formatting can make recovery more difficult. Cancel the prompt and consider professional recovery if the data is important.

Why does my phone charge but not appear on my computer?
The cable may not support data, or the phone may require unlocking and approval of a file-transfer prompt. Try a known data-capable cable and a direct USB port.

What if the error appears before Windows starts?
Check whether storage was recently disconnected and whether the internal drive is detected in the computer’s firmware setup. Avoid changing unfamiliar boot settings; seek repair help if the drive is missing or the data is valuable.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.