I have just un-installed my Sophos AntiVirus for Mac as every time I run a full scan on my multi-drive MacBook this application fills my boot disk and locks the system, requiring it to be powered down by holding down the power switch. Thankfully my MacBook does lock up, thus preventing my data from being corrupted.
It's a shame that this otherwise excellent AV application is spoiled by a simple to fix bug such as this in the software. So I suppose it will be back to Kaspersky!
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