External Hard Drive Showing Wrong Capacity

The USB drive by Western Digital is the My Passport series, for Windows 7, NTFS formatted. It shows, and I've rechecked a half dozen times and looked for hidden files, that total capacity is 465 GB (taking the smaller number) and, for each folder (taking the largest number and even rounding up) the used space should be 160 GB, leaving about 305 GB. Yet Internet Explorer shows these two numbers reversed (almost, it shows 300 GB and 165 for used and free, respectively). Why? As best I can tell, somehow the partition tables or what not are screwed up. I'm pretty confident, having checked a dozen times, my eyes are not playing tricks on me.
I'm mildly curious to fix this, but if I reformat, I'll lose the excellent 'encryption' tool that comes with every Western Digital external USB HD, that makes it impossible to access the drive unless you enter a password (I think the program is called 'WD Unlocker').
What tools can I use to diagnose? Preferably free? I did check the online articles taking about 'shadow' folders and what not, but they would only explain about 10% of the difference. This is a huge difference.
RL

External Hard Drive Showing Wrong Capacity Of One
External Hard Drive Maximum Capacity
Largest Capacity External Hard Drive

External Hard Drive Showing Wrong Capacity Of One

External Hard Drive Maximum Capacity

Explains why a hard drive's capacity often appears to be less than advertised when displaying in Windows or Mac operating systems. Hard drive manufacturers market drives in terms of decimal (base 10) capacity. Indeed, it sounds like a serious matter when system hard drive shows wrong size capacity. You might wonder what might have gone wrong with the disk for showing such unusual behavior. This could even give rise to some doubts whether data residing on hard drive are safe or not. Mostly, when a storage device is not showing the right capacity or space on Windows PC, the most proper cause of this issue is that the external hard drive driver or firmware are out of date. So, to regain the full capacity displaying on your computer, Method 1and Method 2 for updating drive driver and firmware are highly necessary.

Largest Capacity External Hard Drive

Actually you know what. I stil bet my 10$ on quotas. But as a Hard quota. Check File server resource Manager and expend Quota magement Quotas. If you set a hard quota on a volume there, it will display the quota size in explroer but if you open its properties and go to quota, it won't show as a quota has been enabled. External drive reporting wrong capacity in Backup and Restore Hi All, We use a 1tb Western Digital USB3 external drive for a system backup on a desktop PC under windows 10. Mac os sierra free download iso. After formatting it's showing 931gb capacity.