I get the disk could not be unmounted after my external drive was unplugged while reading and writing to it.  What now?

Running OSX 10.9.3  2.5 Ghz i5 16GB ram.  No other known issuses.  while importing some images from my external 1TB drive my son unplugged the USB cable.  I got the error that a disk was not properly ejected and the program Lightroom 4 also gave an error.  I closed both notifications and restarted my comp, no recognition of the drive, shut down the comp and unplugged the external.  Still no recognition in finder, system information sees the drive, Disk Utility sees the drive but keeps giving me the error "disk could not be unmounted."  what else can I try before I have to book an appointment??

Hey there Sirtuc,
It sounds like your external drive is not being recognized after a restart of your computer after the USB cord was unexpectedly disconnected. Restarting is the first thing I would have done as well, and next I would reset my SMC then my PRAM and re test the issue:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
Then:
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
Thank you for using Apple Support Communities.
Take care,
Sterling

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