Requesting help to get Partition & data recovery from USB 3 hard disk 1TB showed on Disk management "You must initialise a disk before logical disk manager can access it"

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  I am using Toshiba USB 3 portable hard disk 1TB. Suddenly I can not see it from my laptop's my computer. I can see disk from Disk manager and surprised to see it all became unallocated 931 GB before it was NTFS format with partitions. I am using windows 10, last one week ago it was okay. I am requesting help to find old partitions with data if any one can  

  Saturday, August 27, 2016 6:30 PM