SOLUTION 1 - Verify if minimum operating system requirements are met.
Operating Systems supported by Cruzer drives:
Windows Vista and higher, Windows XP SP2,Windows 2000 SP4.
Mac users, see USB Flash Drive / Memory card not detected on Mac USB port.

NOTE: We have a few reports that applications for mobile devices such as Samsung KIES and HTC Sync may prevent the USB flash drives being recognized correctly. You may need to turn the application off for the USB drive to be recognized by your PC. Should this not resolve the issue you might need to close the background process of the application or uninstall the application for the drive to be recognized.
SOLUTION 2 - Try other USB ports. If the Cruzer is not receiving ample amount of power from the USB port, it will not function properly. Some desktop computers may need to use the USB ports in back of the computer.
NOTE: For flash drives with an LED, the LED will also not turn on if there is not enough power.
If the Flash Drive does not function on multiple computers, contact SanDisk Support to check warranty status.
SOLUTION 3 -Check status of the Cruzer under Device Manager.
STEP 1 - Connect the Cruzer to the PC
If you receive a 'USB Device Not Recognized' error on the computer, the flash drive is most likely failed. Additional troubleshooting is unlikely to correct the problem.
STEP 2 - Check under Device Manager
NOTE: An administrator right to your computer may be required to perform below steps.
1. Open the Computer Management Console
Accessing the Computer Management Console
2. Click Device Manager on the left pane.
NOTE: The Cruzer might show up under several places under Device Manager such as:
1. Disk Drives
2. DVD/CD-ROM drives
3. Universal Serial Bus controls as USB Mass Storage.

If there is a yellow exclamation point (!) or question mark (?) beside the device, try to refresh the drivers.

STEP 3 - Refresh the drivers
1. Right-click on the entry with the error mark, select Uninstall.

2. On the top menu, click Action then select Scan for hardware changes.

STEP 4 - Verify if the flash drive is detected
1. Double-click My Computer.
2. Look for the Cruzer under devices with removable storage.
SOLUTION 4 - There might be a conflict in drive letters, see Resolving drive letter conflict.

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NOTE: If the above steps do NOT resolve the problem please back up your data and request a replacement using our online web form.