Re: Some help with dd backing up into an iso

[David Christensen <dpchrist@holgerdanske.com>]

On 03/06/2017 09:05 PM, David Christensen wrote:
> If you have an SSD, fstrim(8) will discard all unused blocks, regardless
> of file system.  They should then read as zeros:
>
> https://manpages.debian.org/jessie/util-linux/fstrim.8.en.html

I should qualify that:

    If you have an SSD, fstrim(8) will discard all unused blocks (for
    supported file systems and SSD's).


This computer has a SAMSUNG SSD UM410 Series 2.5" 16GB SSD with ext4 
boot and btrfs root file systems:

2017-03-06 21:48:24 root@jesse ~
# fstrim -v /boot
fstrim: /boot: the discard operation is not supported

2017-03-06 21:52:07 root@jesse ~
# fstrim -v /
fstrim: /: the discard operation is not supported


I need to test my other SSD's.


David