Will files be deleted when reformatting an external drive

For some reason, when I plug in my external hard drive, my mac and pc reply that my external drive (simpletech (re)drive)needs to be formatted. I am wondering if this would delete the oh so valuable data?
please help...
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More about will files deleted reformatting external drive
  1. yes. Formatting the drive will erase the drive and you will lost the data!
  2. ^ Most certainly will be..:(
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