I guess I should not be complaining that transfer speeds are too high but am concerned that files are really being transferred.

I had a file, a bit over 100 megs, and uploaded it with DriverHQ's file manager, and the transfer only took 10 or 20 seconds.

Not believing that such a large file could have actually been transferred in that time, I downloaded it to another area on my local disk, and the download time was comparable.

How can such a large file be transferred so quickly?

Indeed amazing, isn't it? Yes, that's our patent-pending MagicUpload technology. MagicUpload can speed up uploading speed by many many times in some cases. So what you see is normal. For MagicUpload to work, you must use DriveHQ client software (FileManager, DriveHQ Online Backup or Desktop Express)