On Thu, 24 Sep 2015 01:01:38 -0700, "David Kaye"
Post by David Kaye Post by Jeff Liebermann
I haven't seen any such failures, yet.
Oh I agree. As I said I'll be using SSDs for temporary storage, that is
customer files that I need to transfer one place or another, in the same way
I used CDs and DVDs in the past. But for permanent storage I'm relying on
convential USB hard drives.
You may have missed the point of the article. The problem is that
with no power applied and a warm SSD, the leakage currents increase
sufficiently to affect long term reliability. One article claimed
that it's possible to loose data in about a month, if power is not
applied. There are also a few high reliability SSD packagers, that
include a battery. I'm suppose to be giving a talk on SSD to the
local Linux user group next month and have accumulated a collection of
links on the topic. I'll post a few when I return to my office tonite
Incidentally, if you're thinking of hot swapping SSD drives:
"The mysteriously disappearing drive: Are power outages killing
Post by David Kaye
At first I was wary of the larger storage of 3TB drives. I had been quite
content with 200 to 500GB, thinking that the all the extra bytes still have
to fit in the 2 1/2 inch HD physical profile. So, obviously they've got to
make the sectors way smaller. How small is too small? Will a 3TB HD be as
reliable as a 500GB HD?
I have no idea. Reading data off a hard disk drive has been somewhat
of a statistical exercise for at least 20 years. The days when you
can put an oscilloscope on the output of the head and actually see a
"1" or "0" are long gone. These days, the waveform looks like garbage
and the decision as to whether it's a "1" or "0" is an exercise in
decompression, error correction, and probability.
"How NOT to evaluate hard disk reliability: Backblaze vs world+dog"
There are quite a few good links and insights in this article on drive
"Moral of the story: design for failure and buy the cheapest
components you can. :-)"
Obviously, you're not running a server farm and will not be beating
the drives to death. You're counting on the assumption that a lightly
used drive will last forever. That hasn't been my experience as I've
had DOA drives pulled out of old stock when trying to fix a RAID
Drivel: Even pencil and paper are not reliable. More than one of my
customers refuse to inscribe their passwords in a speadsheet, text
file, or suitable program. They write them on the smallest piece of
paper they can find, using a pencil. The paper is then folded,
spindled, and mutilated until the scribbles are unreadable. When it
comes time to login to some account, it can't be read. When I demand
that they transcribble the pencil scratches into a spreadsheet, they
can't read their own handwriting, and just stop. The one customer
that actually did transcribble the scribble pad, managed to get the
upper/lower case letters all wrong. Last week, I had to use a
microscope and UV light in order to extract a password. I wouldn't
have mentioned this, except I have FOUR customers with exactly the
same bad habit. AAAAAAAAAAAAAAAAAAAAAAARGH!
Jeff Liebermann ***@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558