I tells you, right, I’ve got a 3Tb hard drive in this ‘ere iMac and it got down to just 15Gb free. Without my noticing. How dare it.

If you go below around ten percent free space on your hard drive, you pay for it in a dramatic slowness and that’s what I’ve had lately. This is the fastest machine I’ve ever owned, it is so much faster than my last Mac – a Mac Pro that officially ran for six years but actually I’m still using sometimes – that I could design books using the Adobe CC suite. But suddenly it was a molass at opening a folder.

OmniDiskSweeper saves the day. It’s a tool from the Omni Group and it chunders away across your drive, totting up the figures and tutting a bit, then showing you the lay of the land. You’re spending how much space on movies? Everything’s detailed and shown in such a way that you can quickly zero in on the – in this case – more than a terabyte of files to do with one old job. I am at this very moment copying that lot off to an external drive and intend to luxuriate in an iMac that is restored to life and which has enough room to paddle about in.

OmniDiskSweeper is free. Get it where many fine applications are sold, over at The Omni Group. It interests me, mind, that I would not have heard of or found or considered OmniDiskSweeper if I didn’t happen to be an ardent user of one of the firm’s other products and a pretty ardent user of a second. The Omni Group makes the To Do manager OmniFocus and the outlining software OmniOutliner. I am actually waiting for the chance to give them more money for the next versions of OmniFocus, I like it that much.