Is there anything I can use to test it to see if it is sick? Right now they all work fine. But I do wonder if some program can let me know if a drive isnt in perfect health.
Well,
Chscag has already provided information on 'Disk Utility' (DU) which is part of the Mac OS and links to two other apps that are often suggested here; but just to 'show' you what information will be provided by DU, see the two screen captures from my MBPro's verification of my Time Machine backup external HD's partition - plenty of information is provided @ the bottom; plus the window w/ the details shows what was checked (had to scroll thus the reason for 2 images) - the HD is OK.
Years ago, I used Steve Gibson's
SpinRite on PC's running DOS/Windows - an expensive program then and the two Mac ones linked are certainly not free, if you decide to go beyond the trial versions, which likely will not provide all of the features (not sure, I've not used either one)?
Also, your external HDs are about 5 years old and failure rates/year are cumulative, so you are still taking a risk w/ these older HDs (I've had 3 fail on me after 3-6 years) - for some information checkout this
Discussion; and external HDs are now so cheap that if the data is critical, you might want to consider buying a new one or two, but just something that I would likely do. Good luck and let us know which app(s) seem to work for you. Dave
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