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i own 1TB WD HDD, it had two partitions which were formatted as mac os x extended jornaled. now i'm facing a problem , its giving me error disk inserted is not readable . when i checked in disk utility , partition map scheme for hdd was unformatted. can someone guide me tobfix this issue

use testdisk to find the partitions and recover them.

Your going to need to spend 60 seconds reading the manual