Create ISO image without empty space

[Rabinhood]

Dear all, I have a ISO about a Debian custom version bootable.
The Debian OS it's on a MicroSD with 126 giga and the space busy are 60 Giga.
I ask how I can make a ISO with dd command without empty space, to have a final iso with 60 giga.
Thanks.

[peter_irich]

I don't know is it possible. You can mount this iso to any directory and again make the new iso from it,
then unmount old iso and use new.

[Rabinhood]

Thank’s I’ll try it

[cooleo]

I don't know is it possible. You cam mount this iso to any directory and again make the new iso from it,
then unmount old iso and use new.

I think what Rabinhood trying to do is:
create a iso from a USB_stick, so there is not "old-iso" to mount. am I right?

[pylkko]

if you are making the disk image from an existing partition, minimize that partition before you write the disk image.