Volume Bitmap Errors - What Keeps Causing Them?

Question

I've been a recurring issue with my 2010 MacBook Pro (specs below) in recent months.  It seems like every other week, lately, I've needed to repair my internal HD because I keep seeing the following error:
"Volume bitmap needs minor repair for orphaned blocks"
"Invalid volume free block count"
The problem always repairs, successfully.
My computer isn't having any issues (none perceptible to me, anyway).  Yet, my blocks seem to keep getting orphaned.  Why would this keep happening?  How can I prevent it?
Thanks.

Answer 1

Launch Disk Utility and click the icon of the physical drive itself (not the indented volume name). Check S.M.A.R.T. status. Any messages?
When you launch Disk Utility to repair drive is it from Recovery HD or from some other startup drive?
In any case, when you Repair Disk, if you haven't done so before, repeat Repair Disk until no errors are reported. Sometimes one error can mask another.
If you have done the above, it may help to try a more powerful disk utility such as Disk Warrior, but you will need to boot from the utility's disk or from a different startup drive.