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I got this 1TB WD usb Disk. I want to encrypt the whole partition using Ubuntu disk utility with ext4+luks and fill up with zeros the space.

Any idea how can I estimate how long it will take? The tool does not reports this time.

The disk is a WD My Passport Ultra, that comes with hardware encryption but dunno how to use it on Linux. Looks like the software it is only available for Windows and MAC.

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Caveat: I have not tried this myself

What does the INITIAL encryption do in practice?

For all data:
- Read a bunch of the data
- Process it in a special way
- Write it back to disk

Add the time to null out all free space (write zeroes).

Answer:
So the processing time should be similar to reading out all contents, then writing it back, with a slight penalty for processing it in between.


For estimated read speed of a drive:*
Open a terminal and type/copy + execute this (press ENTER on it).

dev="/dev/sdb"; echo "About to do READ-speed test on $dev"; sudo hdparm -Tt $dev

man hdparm will tell what it actually does.

Use lsblk to find out things to type into dev="..."

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