Re: [OCLUG-Tech] SD card

2012-01-21 Thread Rick Leir
The big difference between MMC and SD is that the latter has DRM support. It sounds as if that Wikipedia article could use some improvements. Who is up to it? Thanks -- Rick On 21/01/2012 11:19 AM, Bart Trojanowski wrote: > Flash needs bad-block remapping, block refresh, and write levelling. > I

Re: [OCLUG-Tech] SD card

2012-01-21 Thread Spencer Cheng
On Jan 21, 2012, at 11:19, Bart Trojanowski wrote: > Flash needs bad-block remapping, block refresh, and write levelling. In the > case of a USB attached flash storage these functions clearly get done in > the USB device... in some sort of "processor" or ASIC. > There is definitely intelligence

Re: [OCLUG-Tech] SD card

2012-01-21 Thread Bart Trojanowski
Flash needs bad-block remapping, block refresh, and write levelling. In the case of a USB attached flash storage these functions clearly get done in the USB device... in some sort of "processor" or ASIC. I always thought that MMC/SD devices worked the same. Are you saying that a SD card does this

Re: [OCLUG-Tech] SD card

2012-01-20 Thread Singer X.J. Wang
There is no on card processor on the SD cards.. S On Thu, Jan 19, 2012 at 16:46, Rick Leir wrote: > On 19/01/2012 3:10 PM, linux-requ...@lists.oclug.on.ca wrote: > > the actual capacity of the SD card was noticeably > > less than advertised. > From wikipedia: > All SD cards incorporate a digit

Re: [OCLUG-Tech] SD card

2012-01-20 Thread Charles MacDonald
Love when you pay for a feature that REDUCES the utility of what you bought.. Wasted memory to stop you from using the rest of the card if t does not like what you are doing - Wonderful... On 12-01-19 04:46 PM, Rick Leir wrote: > On 19/01/2012 3:10 PM, linux-requ...@lists.oclug.on.ca wrote: >> t

Re: [OCLUG-Tech] SD card

2012-01-20 Thread Spencer Cheng
On Jan 19, 2012, at 16:46, Rick Leir wrote: > On 19/01/2012 3:10 PM, linux-requ...@lists.oclug.on.ca wrote: > All SD cards incorporate a digital rights management It's a bit more complicated than that. Each SD card has 2 separate FAT(32?) file system on it. The unprotected file system is one y

Re: [OCLUG-Tech] SD card

2012-01-20 Thread Rick Leir
On 19/01/2012 3:10 PM, linux-requ...@lists.oclug.on.ca wrote: > the actual capacity of the SD card was noticeably > less than advertised. From wikipedia: All SD cards incorporate a digital rights management (DRM) scheme. Roughly 10% of the

Re: [OCLUG-Tech] SD card set to read only

2010-06-20 Thread Adrian Irving-Beer
On Tue, Jun 15, 2010 at 01:53:51PM -0400, c...@heyendal.ca wrote: > My understanding is that Linux sets flags on the SD card's > filesystem when accessed (or mounted?). Mounted. But this only applies to some filesystems, such as ext2 and ext3. When you mount an ext2 or ext3 filesystem read-writ

[OCLUG-Tech] SD card set to read only

2010-06-15 Thread carl
On our product there is a script on bootup that reads a config file on an SD card that contains URL information required to download an executeable. Once it has this information the script then calls wget to retrieve the file. However, when the file can't be downloaded due to server or network prob