On Sa, 09.10.21 11:27, www (ouyangxuan10@xxxxxxx) wrote: > systemd version: V242 > > In our system, the whole machine starts too slowly. We want to do > some optimization. I found that two services( loop0.device and > mtdblock5.device) started slowly. I want to remove them (I > personally think our system are not need them). I want to ask you > how to avoid generating these two device files and not start them? /dev/loop0 is a loopback block device. It's probably some tool that needs them you are using. /dev/mtdblock5 is some physical hw you have. And it's probably mounted by something you are using. Lennart -- Lennart Poettering, Berlin