On a sunny day (Sun, 29 Jan 2023 09:32:40 -0700) it happened Don Y
<blocked...@foo.invalid> wrote in <tr6739$2r7um$1...@dont-email.me
>On 1/29/2023 8:52 AM, Don wrote:
>> You may want to limit yourself to lens tissue. I personally always use a
>> soft cloth on all things optical - even plastic - to avoid minuscule
>> wood scratches from paper products.
>> Sometimes a simply different, and not necessarily better, CD reader
>> works for me. I surmise a different readers's optical alignment varies
>> slightly (while within tolerances) to track a random scratched CD more
>Rip the original and put it away. (All of my music collection originals
>reside in a set of boxes hiding under a bed; DVD originals on spindles
>tucked in a clost)
>Use the ripped (ISO on spinning rust or a real optical medium) "copy" until
>*it* becomes unreadable.
A good light proof CD box helps:
Is full now, 1000 CDs.. CD-R.. CD-RW .. Bluray
Disks are numbered from 1 to 1000
There is one big text file that has an entry for each one,
what it contains, how it was made and how to read it, for example:
Platinum 4x inkjet printable
Raspberry debian 8 GB SDcard image with librtlsdr, xforms, fftw3, xpsa, dump1090
Risc OS image
Original debian image
dd if=/dev/zero bs=1000000000 count=25 > bluray.iso
mount -o loop=/dev/loop0 bluray.iso /mnt/loop
cp ... /mnt/loop/
# stay below about 22.3 GB
growisofs -speed=4 -dvd-compat -Z /dev/dvd=bluray.iso
# l /mnt/loop
drwx------ 2 root root 16384 Feb 2 17:55 lost+found/
-rw-r--r-- 1 root root 1939865600 Feb 9 04:44 2013-02-09-wheezy-raspbian.img
-rw-r--r-- 1 root root 159063 Mar 6 13:56 Raspberry-Pi-R2.0-Schematics-Issue2.2_027.pdf
-rw-r--r-- 1 root root 109401 Mar 6 13:59 RPi_Low-level_peripherals.html
drwxr-xr-x 2 root root 4096 Mar 6 13:59 RPi_Low-level_peripherals_files/
-rw-r--r-- 1 root root 229735 Mar 6 14:01 bcm2835-1.22.tar.gz
-rw-r--r-- 1 root root 102683388 Mar 8 15:27 riscos-2012-11-01-RC6.zip
-rw-r--r-- 1 root root 42 Mar 8 15:30 sha1sum_riscos-2012-11-01-RC6.zip.txt
-rw-r--r-- 1 root root 42 Mar 10 13:26 sha1_sum_rasbian_zip
-rw-r--r-- 1 root root 41 Mar 10 13:41 sha1sum_2013-02-09-wheezy-raspbian.img.txt
-rw-r--r-- 1 root root 1590 Mar 10 16:17 how_to_raspberry.txt~
-rw-r--r-- 1 root root 1590 Mar 10 16:17 how_to_raspberry.txt
-rw-r--r-- 1 root root 8193572864
Mar 10 17:16 raspberry_with_rtlsdr_xpsa.img
-rw-r--r-- 1 root root 3965190144 Mar 10 17:36 media_4GB_sdcard.img
-rw-r--r-- 1 root root 41 Mar 10 17:38 sha1sum_raspberry_with_rtlsdr_xpsa.img.txt
-rw-r--r-- 1 root root 41 Mar 10 17:39 sha1sum_media_4GB_sdcard.img
So basically in that case I just make an empty file of the right size,
put a filesystem on that file,
copy all stuff I want to keep to that file
and use it as image that I then burn to the disk.
mount -o loop can then load the disk and you have a directory with all your stuff
Linux of course
Sometimes I just write stuff as image... movies too.
Nashua slimline 4x
MASTER SOURCE as image
Use tar -zxvf /dev/dvd in /video to unpack
Very long list of what is in the tgz follows this entry
Everything in UNIX is a file after all,
There is more....
So far data retention is impeccable,
main way to keep the written disks: Keep It In The Dark.
It is the same thing as with old film camera and exposure
time * light intensity does it.
If you leave your burned disk on the bookshelf in the sun you get data errors after 2 hours,
Keep it in the dark and > 20 years is no problem.