external hdd showing more used space than actual?

[artoo7]

My pc runs on win 10 32 bit. I have a 1TB external hdd of toshiba. it has some videos whose size is around 90gb. but in properties menu it is showing a total of 240gb is used. i checked that if there is any hidden files, but no, there is no hidden files. i also scanned the hdd with antivirus but nothing was found. i cant find any reason for this. please help. thank you.

 

[Kromletch]

Use spacesniffer on it

 

[SkyNetRising]

but in properties menu it is showing a total of 240gb is used.

Did you check Recycle Bin?

 

[BFG-9000]

Disk Cleanup also works on external HDD