.... with sample libraries ...
What do you mean by sample libraries???
jpeg libraies, mp3 libraries, code libraries, video libraries???
My input on this. Unless you are talking super fast drives, with large files (>250MB), the drive speed isn't that big of deal. It's when you have lots of small files (like 500GB of 4K-64K files) that the faster drives really makes a difference.
Have you tried defragging the drive with a "real" defragger (not the POS that is built into Windoze)? Heck, just defragging the directory structure can speed up a slow HD.
I find it is the interface that slows things the most. SATA to SATA the fastest (any version), then USB 3.0, then Gb Ethernet, then 2.0. (Ethernet and slow USB are a toss up. When moving files Gb Ethernet is faster, when doing LOTS of small transfers, USB is faster.)
I just backed up some files onto a 1st gen green drive, and was getting slightly more than 90MB/s (~100gb/s) on large files (system backups) and slower ~40-50MB/s on large numbers of small files (audio books). Also, are you using a full copy, or incremental (copy newer)? I can back up incrementally of LOTS of small files (no copies, just check date stamp on both files) about 600GB RED to slow laptop in about 12 minutes. Full copy is a LOT longer (hours of large parts of days)!
The above statement excludes SSDs, cd/DVD/bluray or slow laptop drives. When coping/ripping to/from optical, you HD won't make 1 bit of difference and slow laptop drives are just slow.