My external hard drive is not recognised on my mac book pro

my external hard drive is not recognised on my mac book pro

Hello all -
similar situation.  Unplugged external hard drive and all to take the laptop on a trip.  On return, I plugged everything back in and keep getting this message:
Time Machine couldn’t complete the backup to “Iomega_Ext_Drive”.
Files can’t be copied onto the backup disk because it appears to be read-only.
You may need to repair or reformat the disk using Disk Utility. If the disk can’t be repaired, you must use a different disk for backups. Open Time Machine preferences to select a different backup disk.
open time machine preferences.   -
I tried this and tried "repair" but that didn't work and I still get this message.  Any advice?  thanks

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      Model Identifier:          MacBookPro7,1
      Processor Name:          Intel Core 2 Duo
      Processor Speed:          2.4 GHz
      Number of Processors:          1
      Total Number of Cores:          2
      L2 Cache:          3 MB
      Memory:          4 GB
      Bus Speed:          1.07 GHz
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