S.M.A.R.T Error while trying to install OS X Mojave
Not long ago I posted another thread pertaining to this issue as well as an admin password issue.
As the latter has been resolved I'd like to isolate the first issue with new context.
Recently, I'd attempted to install the newest OS X Mojave on my roughly 7-year-old Macbook Air 2012 but the process is blocked by something called a S.M.A.R.T error.
Upon Googling, I've found that this indicates a failing hard drive or rather something called an SDD I believe it was as discovered by my stepdad who has experience in IT.
I've backed up all my files (after I'd fixed the password issue I mentioned), started working off the backup drive vs. the Macbook's and have a plan laid out to purchase a new laptop.
However reading other (albeit older) discussions here and seeing other result titles on Google pertaining to a scan showing the disc as fine in contrary to the error or just bypassing/ignoring the error in an installation process have me wondering if I'm about to almost drain my bank account and told my friends to expect cheap or no Christmas gifts this year over some kind of false alarm.
The notion that such a serious claim could be inadmissible seems absurd but is it? Is this legit? My Macbook is continuing to function fine, as it always has.
If this is real, about how long can I expect my disc to hold out?
MacBook Air, macOS Sierra (10.12.4)