On a sunny day (Tue, 4 Jun 2019 22:56:45 -0700 (PDT)) it happened
tabbypurr@gmail.com wrote in
a396789b-e5a3-45d6-af2a-1d88f0ff212a@googlegroups.com>:
I found optical discs too unreliable.
I am not so sure,
I have now lemme see:
996 <- disc number
Mon Feb 18 18:47:05 CET 2019 <- burn date
BD-R25GB <- type
Mediarange 4x inkjet printable <- make
LG BH10LS38 <- burner
996 discs in the dark storage.
The first one is from around year 2000 (did not date those in
those days but filesystem and data on those is dated). I use Linux
ext2 on blu-ray so I can do something like this: Create a large 25
GB empty file named 'bluray.iso':
dd if=/dev/zero bs=1000000000 count=25 > bluray.iso
Make an ext2 filesystem on that file:
mke2fs bluray.iso
Mount it:
mount -o loop=/dev/loop0 bluray.iso /mnt/loop
Copy whatever I want to save to that directory:
cp ... /mnt/loop/
Stay below about 23 GB usage, this shows usage:
du /mnt/loop
Unmount he created image:
umount /dev/loop0
Burn to DVD-R (or DVD-RW)
growisofs -speed=4 -dvd-compat -Z /dev/dvd=bluray.iso
Verify burn byte for byte:
dvdimagecmp -a bluray.iso -b /dev/dvd
I wrote dvdimagecmp, it is on my site, unlike diff it shows
progress and read speed, and where and what the errors are if
any.
http://panteltje.com/panteltje/dvd/dvdimagecmp-0.3.tgz
To use the disc, simply mount it:
mount -o loop=/dev/loop0 bluray.iso /mnt/loop
and go to that directory:
cd /mnt/loop
list:
ls -rtl
Sometimes in case of long binaries like movies I just burn the
whole thing directly as image. Or sometimes I just tar and gzip a
whole directory tree or even a whole partition to a .tgz and burn
that to a disc:
tar -zxvf /dev/dvd will get it back
Important is documentation, after using some database for a while
I changed to one large text file that you can search with 'grep'
for anything, or just search in the text editor. Much faster and
no database crap. All movies are marked as 'amovie' in the text so
cat dvd-list.txt | grep amovie > movies.txt
# l movies.txt
-rw-r--r-- 1 root root 20587 Jun 5 10:14 movies.txt
Use text editor:
278 entries.
Not bad. never have time to watch any,. have seen those anyways...
text files are great, disc 994
994
Fri Nov 23 12:19:43 CET 2018
DVD+R
verbatim inkjet-printable
-rw-r--r-- 1 root root 672137216 Nov 10 13:20
debian-9.6.0-amd64-xfce-CD-1.iso MD5sum
682ad1554a2c3ddd772bc580d1272e7f debian-9.6.0-amd64-xfce-CD-1.iso
growisofs -dvd-compat -Z /dev/dvd=debian-9.6.0-amd64-xfce-CD-1.iso
dvdimagecmp -a /dev/dvd -b debian-9.6.0-amd64-xfce-CD-1.iso
The now about 19 year old discs all still play fine, because those
are in a alu dark box in a dry living room, with controlled
temperature.
The same discs fail if you keep those for a few days in the usual
plastic boxes on the bookshelf where occasionally the sun, or at
evening the room lighting works on those.
It is very much like film exposure,
for those who used 35 mm cameras etc, exposure time * light
intensity is what counts. Without light the image on the disc will
not change a lot over time. Open the box in tempered light if you
need a disc, Moisture will kill those discs too as then mold forms
in the disc, I have seen that, even had to return new ones that
had spots in those.
Paper has hopeless data density, but far outlasts all the others.
Updating versions on it is a bear too.
Na, my drawings just use eraser and modify
I take a picture of the old version (have a scanner but no longer
working drivers for it).
Read speed is abysmal.
Encryption is unworkable. Usable file formats are limited. And...
Leonardo used to write from right to left, or so I have read,
to keep his ideas from being read (and him being executed by the
church likely). At least some people cannot read my drawings so I
am safe
Cloud access gets cut off on a whim. The only time I used it to
keep backup data they announced they were going to start charging.
I tried every way to pay but none worked, and I lost access. They
never sorted it. I think the company went under.
Indeed cloud is a joke.
Sometimes no access, no security.