1.5 TB essential external hard drive "is not accesible" the parameter is incorrect

I have OS 64 bit windows 7 the light on the front is blinking the the drive vibrates like it is running. When i go to my computer the drive shows up but i’m not able to access it, and then i’m prompted to format the disk to be able to use. I don’t want to format it beacuse i have data and pics i don’t want to lose. Please help!!!

Look in Disk Management and look down by the bars what does it say there anything like Raw?



yes it says  RAW

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Well that means somethiing is corrupt. Test Disk http://www.cgsecurity.org/wiki/TestDisk might restore it. There are data recovery programs in this link post 5  http://community.wdc.com/t5/My-Passport-for-PC/Western-Digital-External-Hard-Drive-my-files-lost/td-p/243020
You can also try downloading a Linux Live CD and burn it and boot from that and see if data is accessible. As a last resort the command prompt to convert FAT32 to NTFS sometimes repairs the Raw partition.Hhere is a link describing that http://support.microsoft.com/kb/214579 when you open command prompt right click and run as administrator.