On Mon, 2018-08-13 at 11:00 +0200, Julien Cristau wrote: > A previous iteration on this was > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=722898 A modern SSD can write hundreds of megabytes per second, and contains on the order of a terabyte. Older SSDs are smaller, but slower. Rotating disks are much slower, but typically also many times larger. write speed disk size wipe time note (MiB/s) (TiB) (h) 20 1 15 older laptop HD 200 0.25 0.7 older laptop SSD 500 1 0.6 new laptop SSD 40 1 7 older desktop HD 200 1 1.5 desktop SSD These are calculated times. Real times are likely longer, since wipe speeds tend to be below what the hardware actually achieves. Most people do not need to wipe their disks at installation time, when using full-disk encryption. It would be enough to do that when the system is booted, and can be used, in the background, at a priority that does not hurt normal use. Those that do need it should opt into wiping. As a user experience, having to opt out of something you don't need is not great. Worse, the installer it not a good place to explain the things one needs to make an informed decision. Having the installation process effectively pause even for half an hour is bad. And half an hour is a best-case scenario that only applies to those with high-end hardware. Could we make "wipe disks" into an option in the partitioner, rather than having people cancel what might be a crucially important thing? And default that to "no wiping"?
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