--- title: NEXUS/UltraNEXUS/E-HD2 USB Hard Drive Maintenance description: Procedure for NEXUS/UltraNEXUS/E-HD2 USB Hard Drive Maintenance --- [Skip to content](https://support.leightronix.com/usb-hard-drive-maintenance#main-content) [Create New Support Ticket](https://support.leightronix.com/kb-tickets/new?hsLang=en) [![www.leightronix.com](https://support.leightronix.com/hs-fs/hubfs/LEIGHTRONIX_logo2012a-1.png?width=353&height=75&name=LEIGHTRONIX_logo2012a-1.png)](https://www.leightronix.com/) Open main navigation Close main navigation - [Create New Support Ticket](https://support.leightronix.com/kb-tickets/new) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [LEIGHTRONIX Knowledge Base](https://support.leightronix.com/?hsLang=en) 2. [NEXUS/UltraNEXUS](https://support.leightronix.com/nexus-ultranexus?hsLang=en) 3. [Storage](https://support.leightronix.com/nexus-ultranexus?hsLang=en#storage) # NEXUS/UltraNEXUS/E-HD2 USB Hard Drive Maintenance ## Procedure for NEXUS/UltraNEXUS/E-HD2 USB Hard Drive Maintenance *This only applies to NEXUS, UltraNEXUS, UltraNEXUS-SDI, and E-HD2 servers.* If the NEXUS/UltraNEXUS events log is filled with "Error 1117 (I/O device error)" or "read" errors, this is an indication that the USB hard drive array is having issues. Below you will find steps to try to get the USB hard drive array healthy again: Disconnect the hard drive unit's USB cable from the back of the NEXUS/UltraNEXUS and plug it into a Windows computer's USB port.  Hard Drive Chkdsk Scan: 1. On the PC, go to *This PC* or *My Computer* or *Computer* to see the list of hard drives connected to your PC. Windows should detect the USB drive and give the drive a drive letter. Note the drive letter. 2. Press the Windows key + *R* on the keyboard. This will open the *Run* window. 3. Within the *Run* dialog, type "cmd" and press Enter or click *OK*. You should now have a Windows command prompt visible on your screen (A black window). 4. Type the drive letter of your USB drive followed by a colon (for example, "e:") and press Enter. 5. At the new prompt for your USB drive, type "chkdsk /f" (space between "chkdsk" and "/f") and press Enter. Follow the on-screen prompts to finish checking the USB drive for errors. 6. If asked to dismount the drive so it can run the scan, say yes – "y" and press enter. If the scan finds any problems that cannot be fixed, the hard drive may need to be replaced. Now check the drive for fragmentation.  1. Unplug the USB drive from the NEXUS series system and connect the drive to a Windows PC. 2. On the PC, go to *My Computer* or *Computer* to see the list of hard drives connected to your PC. Windows should detect the USB drive and give the drive a drive letter. Note the drive letter. 3. Right-click the USB drive icon and select *Properties* – a properties window will open. 4. Select the *Tools* tab in the Properties window. 5. Click the *Defragment Now* button – this will open a Disk Defragmenter window. 6. Click the *Optimize Drive* button. 7. In the *Disc Defragmenter* window, select the USB drive, then click the *Analyze* button. 8. It will run an analysis of the fragmentation of the drive. 9. If it is fragmented more than 10% - it should be defragmented. 10. To defragment, click the *Defragment Disc* button. Defragmenting can take a long time, so you may need to let it run overnight. 11. When finished, Reconnect the USB drive to your NEXUS series system. 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