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That -36 is a general I/O error in the filesystem. It usually indicates a physical part of the hard drive is failing, ie. bad blocks. Diagnosing such an issue is not always trivial. Bad blocks are extremely tricky to nail down without third-party tools and even then there's nothing you can do about them. Sometimes you can get to a point where one or more files are taking up some or all of the bad blocks on the drive, preventing errors because the chance of hitting one or more bad blocks with new or updated files is minimized. Disk maintenance routines can also appear to help. Both are short term band-aids. In the end you back up what you can and move on to a new drive.
The first step I would take is to check your startup disk's S.M.A.R.T. status, a sort of early warning system for drives to notify their host Macs that doom is impending, by launching /Applications/Utilities/Disk Utility.app, selecting the physical disk (usually the very first item) on the left side of the Disk Utility window and examining the information at the bottom of the window. A disk that S.M.A.R.T. doesn't believe is failing will show a "Verified" status. A failing disk will show a "Failing" status. Unfortunately, "Verified" doesn't mean the disk is sound, but "Failing" does mean the disk is on its way out. So, if Disk Utility says "Verified" you still have a situation where data can't reliably be written to and/or read from the drive and no built-in tools to pinpoint the cause.
First things first: What does Disk Utility say in your case?
_________________ Keith GugliottoPrimordial Sea CaptainSplasm Software https://www.splasm.com
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