If your hard disk is slow reading its folder structure
You may experience this problem: no matter how fast your hard disk is, it may be slow when it reads the directory structure, i.e. its table of contents. If you don’t know what I mean, perhaps you don’t have this problem, otherwise, when you open Windows Explorer and start to move from folder to folder in your disk, you must have noticed a long and annoying pause from time to time, as the disk struggles to read and let you go on to the next folder until you find what you need to open.
When this happened for the first time, I thought it was a problem with capacity, that a 2TB disk can not but be slow. Fortunately enough, this is not the case.
You just need to defrag and deep optimize your disk. When you do this, you will be surprised how fast you can browse. For deep optimization I use Smart Defrag. You can try of course the native Windows Defragmenter, and if you still have the “folder structure reading” problem, go on and download Smart Defrag.
After you copy large amounts of data the problem reappears, and you have to optimize again your disk.