1) No need to add a defrag app. if using Windows 10.
It's probable that Windows 7 and 8 also include. this.
2) So make sure it is enabled, but you can CHECK to see if it's fragmented and run if necessary by:
a) open File Manager
b) right-click drive, "properties" -> "tools" -> "Optimize"
c) click "optimize" (may tell you it's not needed. also see if a profile exits. Default is weekly I believe)
3) *60MB/second probably doesn't mean it is "slowing down" overall (not wearing out)
- the OUTER EDGE can be accessed 2X faster than the inner edge due to the lateral velocity
- outer-> 100MB/s
- inner-> 50MB/s
60MB/s is about right if transferring newer files sitting near the inner edge.
4) run diagnostics if concerned about reliability.
5) Other solutions include:
a) get an SSD and/or newer hard drive
b) If only the SSD you'd need to borrow an HDD temporarily (unless you reinstall Windows which isn't a bad idea)->
1- buy 256GB SSD
2- format it to test, update firmware etc if needed
3- MOVE enough data to drop below 200GB (for Steam games you can just copy the "Steamapps" folder, though MODS are a hassle)
4- Clone - Machrium Reflect Free, for example
5- test
6- format 500GB SSD (FULL, NTFS format not quick. Takes hours but should rebuild the bad sector table)
7- move back data, sort out Steam if necessary etc.
BUYING your own HDD would be even easier. if interested, see PCPARTPICKER. I prefer SAMSUNG, but for a tight budget, possibly (do own research) something like THIS:
SSD -
http://pcpartpicker.com/product/gf98TW/a-data-internal-hard-drive-asp550ss3240gmc
HDD -
1TB
http://pcpartpicker.com/product/MwW9TW/western-digital-internal-hard-drive-wd10ezex
2TB
http://pcpartpicker.com/product/KyCwrH/seagate-internal-hard-drive-st2000dm001