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Sure, you can do partial trim with mdtrim (See --reserve option) to always leave some amount of free space untrimmed. Or you could simply create some big file with dd(1) on your encrypted FS to use up some space, which will then never be trimmed (nor used by you). I guess trimming all but ~30% of unused space will give you plenty of performance benefits, ...


I think I found the answer and blkdiscard is the answer. Before formatting the existing windows2000 partition with ext4, I can discard all the blocks belonging to that partition using blkdiscard application. Probably I don't even need to do it explicitly as formatting with a recent linux distribution (mkfs.ext4) will implicitly perform a blkdiscard of the ...

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