Find Bluetooth pairing, USB detection and Device Manager error guides. Match the device model and code before changing drivers or removing a device.
General troubleshooting guides are distinct from reports of a known issue affecting a specific version. Check the conditions in each article.
▦USB external SSD / M.2 SSD enclosureTroubleshooting guide
A USB 20Gbps or USB4 external SSD copies large files far below the maximum speed on its product page, no faster than a 10Gbps or 5Gbps product
Windows 11 / Windows 10 desktop or laptop PCs with a USB 20Gbps (USB 3.2 Gen 2x2), USB 40Gbps (USB4) or Thunderbolt external SSD or M.2 SSD enclosure attached, where transfers never reach the product's advertised speed and stay at 10Gbps or 5Gbps levels or lower
▦Windows 11 / Windows 10 external USB storage (removal policy, write caching, USB selective suspend), bus-powered and self-powered USB hubsTroubleshooting guide
An external HDD or SSD vanishes partway through a multi-gigabyte copy or backup, and File Explorer stops the copy with an error such as the device being unreachable
Windows 11 / Windows 10 (the default removal policy is Quick removal from Windows 10 version 1809 onwards). For the power-delivery side, Buffalo’s published explanation of self-powered and bus-powered USB hubs is used (published 2015-12-10, updated 2017-05-19; the figures are for USB 2.0 hubs)
▦Windows 11 and Windows 10 PCs showing a connection notification after something is plugged into a USB-C port: a device, a dock, a display or a chargerTroubleshooting guide
A notification such as USB device functionality might be limited appears as soon as something is plugged into USB-C
Microsoft's support page carries steps for both Windows 11 and Windows 10, where the notification setting lives in different places. Eleven notifications are listed, and Microsoft does not state that the same explanation applies to wording that is not on the page. The page was read on 2026-09-21.
▦Windows USB power managementTroubleshooting guide
USB devices repeatedly disconnect after idle or sleep.
Windows 11 (confirm the edition and hardware requirements for the feature)Code 43
▦Windows 11Troubleshooting guide
Bluetooth is missing from Quick Settings
Windows 11
▦Windows 11 BluetoothTroubleshooting guide
The device does not appear in Add device
Windows 11
▦Windows USB / Device ManagerTroubleshooting guide
The USB device is not recognized
Windows 11 / Windows 10Code 43
▦Windows Device ManagerTroubleshooting guide
A network, audio, USB, or other device does not work
Windows 11 / Windows 10Code 10