This SD Card. what did you use to copy files onto it.
Source you plugged it into and copied these files to SD Card.
8MB should take 5 seconds.
Some files might be protected on the SD card.
During the transfer, that would end the transfer if this was the case.
And your comment of why would someone go through all that trouble copying to C & then E-HDD. You mean a whole 15 seconds to do the complete process??
And no, that is not the case that if the files would copy to C:\ than they would copy to E-HDD
Not True.
Many reasons on the E-HDD can cause this
Improper format or damaged file structure
improper Ownership & permissions on E-HDD
Encrypted drive
OR
Files on SD Card are file protected or encrypted