Normally I am careful to periodically back up my files, especially my photos and videos. While I often sync my "favorite" photos and videos to Google Photos where I have unlimited storage, I also prefer to back up my original RAW photos (in Canon CR2 file format) and AVCHD videos (in MTS file format) to external hard drives. Since February 2018, my 3TB external hard drives reached capacity, and I had a variety of excuses to delay the purchase of additional external hard drives: busy at work, looking for a good deal on higher capacity drives, etc. So I have copies of all of my photos and videos leading up to February 2018 on 2 external hard drives. From February 2018 to today, I have had only 1 copy of my iMac hard drive, and they could potentially vanish in the event of a hard drive crash.
Sometime in mid- to late-2018, I started getting SMART notifications that my iMac internal hard drive was showing signs of wear and tear. I also noticed that on startup, the progress bar would sometimes pause at about three fourths of the way to completion. Sometimes it would eventually finish the boot process, and at other times it would simply hang, and I would be forced to power off the iMac and reboot. All signs of impending disaster.
Black Friday rolled around, and I decided to finally purchase a pair of shiny new 8 TB external hard drives. They were back ordered but finally arrived the second week of December (i.e., a couple weeks ago). However, the 8 TB drives have been sitting in my office unopened ever since. Enter more excuses for not backing up my files: holiday shopping, family gatherings, catching up on paying bills, etc.
Today I wondered if resetting the PRAM would help fix some of those startup issues that I described above. So I went ahead and restarted my iMac while holding down the command, option, P, and R keys (warning: don't try this unless you know what you are doing). As expected, the iMac restarted once, detected the PRAM reset request, and restarted again. All expected behavior so far. But when it restarted the 2nd time, it booted into my TechTool Pro rescue partition. Hmmm, that was strange. But since I was there, I ran some diagnostics and with the exception of the SMART warnings that I already knew about, everything checked out OK. So I decided to restart my computer normally. However, in the startup volume selection dialog box, my Macintosh HD volume was nowhere to be found. That explains why the machine rebooted into the TechTool Pro rescue partition. I tried warm and cold reboots, but now each restart would arrive at the screen with the Apple logo, stop loading, and simply hang.
I spent the next several minutes in disbelief that I have preached to all my friends and family that they should back up their files and that every hard drive is essentially a ticking time bomb. Well, it looks like my hard drive's time bomb exploded today, with nearly a year's worth of photos and videos (304.28 GB to be exact) not backed up.
After 3 or 4 failed attempts to start my iMac, I tried restarting in Safe Mode (again, described here). No luck. However, restarting in Recovery Mode (restarting while holding the Command and R keys) did give me access to macOS Utilities:
From there I was able to run Disk Utility and run First Aid on my Macintosh HD volume. Among a variety of other usual tasks, I noticed that Disk Utility performed some "deferred repairs" on the volume. I think that did the trick, as I was then able to restart the iMac and get access to the Finder.
WHEW! I am backing up files as I write this post. Fingers crossed that I have not lost any precious moments. Normally I don't make any new year's resolutions, but in 2019 I resolve to regularly back up my files.
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