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+--- Thread: External DVD/CD (/showthread.php?tid=8987)
RE: External DVD/CD - ab1jx - 03-06-2021
I was so impressed by the MTBF figure of 180 years on my Intel nvme SSD that I bought another of the biggest size I could get (2 TB). I put the 2nd one in a USB adapter, might collect a couple more. It's possible for some program to erase them but other than that I figure it'll last my lifetiime. This isn't offline storage, it doesn't actually get it out of the way. But in an external unplugged USB adapter it almost is. I put a few spinning rust hard drives into them too, if they aren't plugged in they aren't spun up and wearing out.
The ones that hold 3.5 inch drives have power supplies, the ones with laptop drives or nvme are USB-powered. A 3.5 inch can go up to 10 TB I think, maybe more. I have a 2 TB laptop drive in one, but the PBP doesn't supply enough power to run it, it needs a powered hub.
RE: External DVD/CD - Arwen - 03-07-2021
(03-05-2021, 12:04 PM)ab1jx Wrote:The M-Disc BURN data in to non-organic materiel, thus are not re-writable. That is the whole intent, make it very hard to flip bits after a burn.(03-05-2021, 09:43 AM)Arwen Wrote: In reality, my "important data" is less than 4.7GBytes so I probably could have gotten away with single layer DVD M-Discs.I haven't looked, do those come in rewriteable? A multi-session burn will let you keep using parts of it each time, so you could have versioning even without being rewriteable. You sacrifice a little capacity for that.
I don't know if they can be appended to, using multi-session.
My usage of them is archival storage. Burn once, file away.
RE: External DVD/CD - ab1jx - 03-07-2021
I once did a quick price comparison and just buying hard drives compared well with removables. 2 TB is around $55 https://www.google.com/search?psb=1&tbm=shop&q=laptop+%22hard+drive%22&hl=en&ved=2ahUKEwjll4j6jJ_vAhXCgMAKHUeeCGgQu-kFegQIARAS 3.5 inch goes a little bigger and cheaper per terabyte. I think the internet archive (archive.org aka the wayback machine) found it was most cost-effective, or did years ago. 2 TB seems to be the max size of a laptop (2.5 inch) hard drive.
You can get 2 TB of nvme SSD for around $225. https://www.google.com/search?psb=1&tbm=shop&q=2tb+nvme+intel&hl=en&ved=2ahUKEwjll4j6jJ_vAhXCgMAKHUeeCGgQu-kFegQIARAS
But yeah, there's at least a theoretical advantage to mostly indestructible offline storage. And if 1 fails most of them are probably OK. 2 TB is 465 DVDs. I was buying them on sale at Staples, Sony only, for $20/100 pack around 2009, so that was $93 for 2 TB. And 465 DVDs is a lot of plastic. I see advantages to both methods.
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I just wrote this and tested it. apt-get install par2, then save this as something and chmod +x it.
Code:
#!/bin/bash
# Makes par2 files for all files in a dir with extension on cmd line
# Use like parall doc, or parall jpg (no period)
shopt -s nullglob
for f in *.$1
do
/usr/bin/nice -n19 par2 create -r10 $f
done
# make a pars dir and put all the clutter in there - copy back to use
mkdir -p pars
mv *.par2 pars