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drive wipe - random or zeros


elcapitan

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Qquestion:

 

What method does cleaner use to wipe disks?

 

I we that it is fast. .. having just used delete cmd line.

 

Reason I ask is not security Q...... it is about space & compression. With the win10 deadline approaching I am doing a lot of disk imaging at diff stages to backstop any probe (had a dual switchable gdfix laptop that caused headaches)...... and having a shock when a supposed empty disk is making v large images.

 

Zeroing the free space means MACRIUM GHOST ACRONIS etc just sees a large block of zeroes and squashes it to next to niL...... much quicker too.

 

 

So zeroes or random? Roadkill blanking util v slow. sdelete not too slow.

 

 

Any typos sort blame wretched tablet & predictive overrides.

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Ah sounds good just been getting sector copy images of same disk dropping from 150 to 200 gb down to 10gb, a 400gb drive down to about 8gb !! Used ccleaner on another machine about to prep so am happy don't need to lose a few hrs deleting it

 

Fab

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