I have a 1TB WD Elements USB 3.0 drive that’s 2 years old. I use it once a week as a backup drive for my desktop computer. It was working well last week.
This week, writing to the disk is about 10 times slower than it was last week, and sometimes fails. Reading from the disk works at normal speed.
Right now I’m running a program to write random data to the disk and it’s generally writing at about 10 MB/s although there are occasional bursts up to 30-60 MB/s.
I have reformatted the drive using both APFS and ExFAT, tried writing to the drive using three different computers (two Macs and a Windows PC), and tried two different cables, one of which I know is good. The problem is simply that the drive is writing ~10x slower than it was last week.
I don’t know what might cause such a problem or how to fix it, if it can be fixed. Any thoughts? If this is a sign that the drive is failing, then I’ll throw it away and be disappointed that it failed after only 2 years of occasional use. If this is the result of a firmware bug then I’ll pass the drive along to a friend or family member who might get some use out of it. (I already bought a different drive for my backups this afternoon.) Thanks in advance.