All i can say is that blkid returned "ntfs", this means that it really is NTFS and not some other partition type that Windows couldn't mount. It also shows a Windows/ntfs uuid (shorter than Linux/ext uuids).

This is strange. Frankly, i got no more ideas right now, as Windows *should* be able to see and mount the partition, i.e., it should be automatically available as one of the "drive letters" (ala E:, F: or something).

I pass..

In Windows, did you check the ownership of the disk and / or the file system in Windows Explorer? Windows honors Windows file permissions. Linux does not. If it is a Windows system disk from another computer or has strict file permissions, your Windows will honor those permissions and you will not have access. If that is the case, you have to change the permissions or ownership as an admin.

yesterday I have taken it to servicing centre there the technician done virus scan and all the data appeared in his system and again when I take to my home and try to connect it same problem is appearing. I have tried to mount it in a newly formatted OS and there is no use.

Looks there is a problem with your machine, either a faulty USB port or cable, or a corrupt system.

Did you try using another USB cable as one member suggested? Also it might be Windows does not recognize your external drive electronics. Does the icon that shows the existence of an external drive appear in the system tray when you attach the drive? Do you have another external enclosure of a different brand you could try?

solved my issue with lot of struggle and posting how I did it
 

At first I have tried stellar phoneix data recovery software in windows which has taken approximately 12 hours just to scan the drive to recover and asking some more time to store the data to another temporary disk. Then I thought better to use dolphin browser to copy data to temporary disk and the process has taken three days due to frequent power failures.Then I have ran the command ddrescue command and the process has taken 18 hours.

Here I have used another external harddisk of size 1TB to data recovery.

What I have learned from this is that while working with linux we have to properly shutdown the system otherwise the situations may be disastrous.Actually the problem started due to improper shutdown of linux.Previously improper shutdown has been occured many times while operating windows OS but I have never encountered such a problem.


A note about dolphin or nautilus browsers.

Actually details about my data on source disk are 750GB,184000 folders,1008400 files.
When I first tried to copy data to some destination disk approximately it has taken two hours just to create directories then power failure occured and so I have resarted the copy process and again it has taken 1.5 hours just to parse directories. I think that file copying of large volumes of data in linux is very slow.


Regards,

Rupesh.

Yeah, it's gonna be slow. Not just in linux. You're dealing with 750gb over USB. I wish you the best of luck, and a lot of patience.