Problem attempting to use xorriso

[Richard Owlett <rowlett@cloud85.net>]

Due to limited bandwidth I purchase complete sets of Debian 
install DVDs.
I had successfully created *.iso files for 12 of the 13 DVDs for 
version 8.6.
[The MD5SUM of one DVD does not match list at 
http://cdimage.debian.org/debian-cd/8.6.0/i386/iso-dvd/MD5SUMS]

I attempted to follow the example given by Thomas Schmitt in 
https://lists.debian.org/debian-user/2015/09/msg00421.html He had 
suggested:

  for i in /media/distributionA/DVD*.iso
  do
    xorriso -osirrox on:auto_chmod_on -overwrite nondir \
            -indev "$i" \
            -extract /pool /media/distributionA/poolA
  done

To account for my current directory structure I had modified it 
to bee:

  for i in /media/root/jessie-dvds/dvd8_*.iso
  do
    xorriso -osirrox on:auto_chmod_on -overwrite nondir \
            -indev "$i" \
            -extract /pool /media/myrepo/pool
  done

My running copy of Debian is on /dev/sda9 and had ~4GB of 10GB used.
When my run crashed it had no free space left.

A extract of what showed on the terminal is:

Extracted from ISO image: file '/pool'='/media/myrepo/pool'
xorriso 1.3.2 : RockRidge filesystem manipulator, libburnia project.

Copying of file objects from ISO image to disk filesystem is: Enabled
xorriso : NOTE : Loading ISO image tree from LBA 0
xorriso : UPDATE : 5199 nodes read in 1 seconds
Drive current: -indev '/media/root/jessie-dvds/dvd8_11.iso'
Media current: stdio file, overwriteable
Media status : is written , is appendable
Media summary: 1 session, 2288090 data blocks, 4469m data, 5577m free
Volume id    : 'Debian 8.6.0 i386 11'
xorriso : UPDATE : 35 files restored ( 47065k) in 1 seconds , 34.6xD
xorriso : UPDATE : 37 files restored ( 72465k) in 3 seconds , 11.8xD
.
.
*MASSIVE SNIP*
.
.
xorriso : UPDATE : 2991 files restored (2646.6m) in 336 seconds , 
0.9xD
xorriso : UPDATE : 3016 files restored (2648.1m) in 337 seconds , 
1.1xD
xorriso : FAILURE : Cannot write all bytes to disk filesystem 
path '/media/myrepo/pool/main/n/ns3/ns3-doc_3.17+dfsg-1_all.deb' 
: No space left on device
xorriso : FAILURE : Cannot restore regular file to disk 
filesystem: '/pool/main/n/ns3/ns3-doc_3.17+dfsg-1_all.deb'
xorriso : SORRY : Restoring failed: 
'/pool/main/n/ns3/ns3-doc_3.17+dfsg-1_all.deb' = 
'/media/myrepo/pool/main/n/ns3/ns3-doc_3.17+dfsg-1_all.deb'
xorriso : UPDATE : 3022 files restored (2649.4m) in 338 seconds = 
5.9xD
xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'
xorriso 1.3.2 : RockRidge filesystem manipulator, libburnia project.

Copying of file objects from ISO image to disk filesystem is: Enabled
xorriso : NOTE : Loading ISO image tree from LBA 0
xorriso : UPDATE : 4569 nodes read in 1 seconds
Drive current: -indev '/media/root/jessie-dvds/dvd8_12.iso'
Media current: stdio file, overwriteable
Media status : is written , is appendable
Media summary: 1 session, 2290589 data blocks, 4474m data, 5577m free
Volume id    : 'Debian 8.6.0 i386 12'
xorriso : FAILURE : Cannot restore directory to disk filesystem: 
'/pool/contrib/b/beast-mcmc' : No space left on device
xorriso : SORRY : Restoring failed:  '/pool/contrib/b/beast-mcmc' 
= '/media/myrepo/pool/contrib/b/beast-mcmc'
xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'
xorriso 1.3.2 : RockRidge filesystem manipulator, libburnia project.

*NOTHING* had gotten thru to intended destination partition.

How many things did I do wrong?
Help please.