USB Drive Doesn't Appear Anywhere

This flash drive isn't visible on the desktop, in the finder, in Disk Utility. I know if I eject it by just pulling it out, I will get the message that it may have been damaged. I don't know what to do. Any ideas?

In Finder, Finder menu, Preferences, General, Show these items on the desktop. Put a check mark in External Disks. (And the others, if you also want them visible.)
...in Disk Utility...
If it isn't visible in Disk Utility, then you may have other issues with the flash drive. Have you tried a different flash drive on the same computer? The same USB port? Have you tried the non-mounting flash drive on a different Mac? (Or PC, if it's in a compatible format.) If it's not showing up at all, you may have no choice except to pull it out. If you're really worried, then you can shut down your Mac before pulling out the flash drive. (Shut down, not sleep.) That will ensure that the Mac will close and unmount the drive as best it can.

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/devices/pci0000:00/0000:00:02.1/usb1/1-1 (usb)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0 (usb)
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/devices/pci0000:00/0000:00:02.1/usb1/1-1 (usb)
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/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/scsi_host/host10 (scsi_host)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/scsi_disk/10:0:0:0 (scsi_disk)
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/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/bsg/10:0:0:0 (bsg)
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/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0 (scsi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/scsi_disk/10:0:0:0 (scsi_disk)
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/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/scsi_generic/sg5 (scsi_generic)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/bsg/10:0:0:0 (bsg)
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/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/block/sdd (block)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/block/sdd/sdd1 (block)
/devices/virtual/bdi/8:48 (bdi)
/devices/virtual/bdi/8:48 (bdi)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/block/sdd (block)
/devices/pci0000:00/0000:00:02.1/usb1/1-1/1-1:1.0/host10/target10:0:0/10:0:0:0/block/sdd/sdd1 (block)

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See
iOS: Device not recognized in iTunes for Windows
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Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP
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However, after your remove the Apple software components also remove the iCloud Control Panel via Windows Programs and Features app in the Window Control Panel. Then reinstall all the Apple software components
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USB Drive Doesn't Appear Anywhere

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