Re: USB Install Fails, Complains about CD-ROM
- Date: Sat, 12 May 2018 19:27:46 +0200
- From: Pascal Hambourg <pascal@xxxxxxxxxxxxxxx>
- Subject: Re: USB Install Fails, Complains about CD-ROM
Le 12/05/2018 à 01:04, Rick Thomas a écrit :
After doing the cp or dd to write the .iso to the USB, do you do a “sync” before you eject it?
I don't, because I don't feel the need to.
According to its man page description, sync "flush file system buffers",
but the destination is a raw device, not a filesystem, so filesystem
buffers should not be involved.
Writing to a USB stick can seem to go quite fast
Not in my experience when writing to the raw USB device.
The USB drives I use have an activity light. It stops blinking as soon
as the dd or cp command terminates. I also monitor block I/O with vmstat
and block writes drop as soon as dd or cp terminates. If I run sync, I
do not see any more activity from the light or vmstat.