There is some old data that claims a life cycle replacement of 100,000
writes.
In use, that is once per day, every day, for 10 years.
Frank Filippone
BMWRed735i@xxxxxxxxx
On Mon, Feb 10, 2020 at 1:41 AM Peter Stevens <dmarc-noreply@xxxxxxxxxxxxx>
wrote:
Thank you very much, Aram and Xavier!
Best regards,
Peter S.
On Feb 10, 2020, at 6:34 AM, Bille Xavier F. <hot_billexf@xxxxxxxxxxx>
wrote:
Gentlemen,
Aram is right, the number of red/write cycles on a SD device is long
enough. It will outlast 5 generations of bigger/quicker cards..
In fact, the operation of reformating is just the rewriting of a new FAT
(File access table) onto the begining of space available. The rest of the
mapped space is left untouched.
If a cell of the SD device weakens, it is declared as "unavailable" and
the system will skip it and it goes to another free one.
This mecanism was really important back in the days when vibrations would
lead to the reading/writing head accidentally "lands" onto the surfaceof a
spinning disk.
But a SD card has virtually no mechanical interface, if it dies, it will
be probably be the fault of the camera/storage interface circuit. And as it
is made of transistors, it will last a while.
some 10 years ago, I had one USB stick (same technology as SD card) that
died. But I used it for two years as my main Ubuntu drive and obviously it
had reached the write cycle limitation in some special areas (typically the
/tmp ).
But since, the devices have improved.
Reformat as much as you want Peter, you'll get tired of it before the card
dies 🙂
#-----------------------------------
From : Xavier F. BILLE
mail : hot_billexf@xxxxxxxxxxx
Maisons Alfort - France
------------------------------
*From:* leicareflex-bounce@xxxxxxxxxxxxx <leicareflex-bounce@xxxxxxxxxxxxx>
on behalf of Aram Langhans <leica_r8@xxxxxxxxxxx>
*Sent:* Monday, February 10, 2020 1:42 AM
*To:* leicareflex@xxxxxxxxxxxxx <leicareflex@xxxxxxxxxxxxx>
*Subject:* [LRflex] Re: Does Re-formating An SD card Between Two
Different Cameras Degrade The Card
Hi Peter. I am not sure the answers you have received really answer your
question. All SSD devices have a limited write cycle life span. Every
time
you write to one of them, it shortens the lifespan. Not when you read from
them. So, yes, formatting and indeed using the card shortens its lifespan,
but that lifespan is considerable, so I don't think you will ever see the
end of the lifespan effected by the number of write/format cycles you
subject it to. It will probably outlive you by a generation or so. Of
course, there are other ways it can fail, both mechanical and
electromagnetic abuse. They are rather flimsy little buggers, aren't they?
I am always afraid I will snap one in two if I push it too hard into my
laptop. Or if I forget it is in there as it sticks out the side a bit and
could easily catch on something and possibly snap.
I do agree that if you format it in the camera you are using, you will have
less problems than trying to format it on a computer.
So, shoot away, format away, and have fun.
-----Original Message-----
From: Peter Stevens (Redacted sender "fritzj3" for DMARC)
Sent: Sunday, February 09, 2020 11:56 AM
To: Leicareflex Photo Group
Subject: [LRflex] Does Re-formating An SD card Between Two Different
Cameras
Degrade The Card
Hi. Technical question for y’all. Can a person use one specific individual
SD card in multiple camera brands? If you have an SD card being used in one
camera body, say an Olympus, and you take that card out of the Oly and
install it in say a Panasonic and re-format in the Panasonic, does the card
suffer any degradation in performance or capacity? Can you then go back to
the Oly and re-format in the Oly without harm? Thanks.
Best regards,
Peter S.------
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