> > Controllers in modern cards are designed so as to balance writes
> > across the card. That coupled with good error detection and
> > correction routines should make the card last forever under normal
> > load. That is assuming "normal" error rate. Could happen that the
> > memory on the cards i
On 3/15/2011 11:29 AM, Krisjanis Linkevics wrote:
SD cards have controllers inside as well. This is "hard data" from an
Apacer datasheet of 2005: "The SD Memory Card includes an intelligent
controller that manages interfaced protocols and data storage and
retrieval as well as Error Correction Cod
> Kris, I am somewhat confused now. What you say makes perfect sense
> except one detail. I thought that CF cards were those that had
> controller on board. The SD cards as I understand don't have controller
> on board. Therefore it makes certain sense (may be not too much sense,
> but still) to wr
On Mon, Mar 14, 2011 at 09:16:11PM -0400, Bruce Walker wrote:
> On 11-03-14 9:07 PM, steve harley wrote:
> >
> >of course reformatting frequently will increase the number of
> >writes of those directory blocks, and thus wear those blocks out
> >even faster
>
> Yeah, exactly, which is one reason wh
On 3/14/2011 10:25 PM, Krisjanis Linkevics wrote:
Now whether cards become bad with time or not is mostly dependant on
the hardware/software controller on the card itself - depending on
how good it is at choosing places to write files and how good it is
at marking the bad spots on the card - the
On 11-03-14 9:07 PM, steve harley wrote:
On 2011-03-14 18:37 , Bruce Walker wrote:
On 11-03-14 5:21 PM, steve harley wrote:
On 2011-03-14 14:54 , Bruce Walker wrote:
Now if a bad block is discovered on your Flash device while trying to
read the directory structure, I assume that the bad block
On 2011-03-14 18:37 , Bruce Walker wrote:
On 11-03-14 5:21 PM, steve harley wrote:
On 2011-03-14 14:54 , Bruce Walker wrote:
Now if a bad block is discovered on your Flash device while trying to
read the directory structure, I assume that the bad block will
immediately be remapped, but the dama
On 11-03-14 5:21 PM, steve harley wrote:
On 2011-03-14 14:54 , Bruce Walker wrote:
Now if a bad block is discovered on your Flash device while trying to
read the directory structure, I assume that the bad block will
immediately be remapped, but the damage is already done. Not physically
damaged
On Mon, Mar 14, 2011 at 5:52 PM, Bob W wrote:
>> From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of
>> Krisjanis Linkevics
>> > But
>> > formatting may (although it's no guarantee) repair a glitch in an
>> iffy
>> > card and let you continue using it.
>> >
>> > -bmw
>>
>> Some
> From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of
> Krisjanis Linkevics
> > But
> > formatting may (although it's no guarantee) repair a glitch in an
> iffy
> > card and let you continue using it.
> >
> > -bmw
>
> Some facts and common sense:
I'm sorry, but you're going to
On 2011-03-14 14:54 , Bruce Walker wrote:
Now if a bad block is discovered on your Flash device while trying to
read the directory structure, I assume that the bad block will
immediately be remapped, but the damage is already done. Not physically
damaged of course, but files could appear to be un
On 2011-03-14 14:25 , Krisjanis Linkevics wrote:
What formatting these does should be exactly nothing (or equivalent to deleting
files) but formatting is done with a piece of software on the host computer (or
camera) and therefore can introduce more writes/deletes than necessary.
What people f
On 11-03-14 4:25 PM, Krisjanis Linkevics wrote:
But
formatting may (although it's no guarantee) repair a glitch in an iffy
card and let you continue using it.
-bmw
Some facts and common sense:
SD memory is NAND flash which means the following things:
1) manufacturers ship it with errors already
13 matches
Mail list logo
