I've tried to CONVERT the disc Fat32 to NTFS and data become invisible

I have a Verbatim 53018 Store n Go 1TB USB 3.0 2.5 Inch External Hard Drive.
It's formatted as FAT32. I attempted to copy 4GB or larger HD video file to the drive, Windows gave me an error.
I typed "convert f: /FS:NTFS" to the CMD. It seemed okay when it's done. Then I double clicked the drive and came across "this folder is empty". When I turn back to "Computer" the disc seems fine "410 GB empty, 931 GB general"
and the disc is still Fat32. :S !?

I don't want to lose all my data by formatting.
I just wanted to change the format to be able copy larger files. I didn't do anything wrong.
Is there any solution to be able to get my data back become visible?

http://support.microsoft.com/kb/214579

Quote:

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NOTE: Although the chance of corruption or data loss during the conversion from FAT to NTFS is minimal, it is best to perform a full backup of the data on the drive that it is to be converted prior to executing the convert command. It is also recommended to verify the integrity of the backup before proceeding, as well as to run RDISK and update the emergency repair disk (ERD).

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Stop messing with it and try to run some data recovery software to attempt to get your files back.

I don't think I can reach my videos.
The important files are my videos and those are .mts format. I don't think there is a recovery software that can recover .mts files. :S

Any decent recovery software will recover ANYTHING.

I can highly recommend 'EASEUS Data Recovery Wizard Professional'
Just used it yesterday after I in all my staying up too late and too tired decided to format my good HDD :)

It pretty well recovers everything from the beginning of time.
Beaware it can take a long time, and it will find everything including deleted files from years ago.
You can select the obvious folders to recover.
As long as files haven't been over written in the meantime you should be good to recover.

Diskinternals Uneraser. Worth every penny.