Nope, it works just like the write protect tab on the late lamented 3 1/2" floppy disk. Exactly the same. Now there is supposed to be security firmware inside SD cards having to do with some DRM scheme or other, but AFAIK it's never been used anywhere. The actual write protect tab is simply a mechanical reminder.

On 7/12/2011 4:25 PM, John Sessoms wrote:
I think it depends on which position the lock tab is in when it falls out.

From: "P. J. Alling"
I speak from experience if the tab is gone the card is locked.  If
you;d like I have a two Gig SanDisk Extreme card I'll let you have
for half the cost of a new one, only missing the write enable/protect
tab.

On 7/11/2011 11:54 PM, Joseph McAllister wrote:
I think the opposite is true. If the locking tab is gone, you
cannot lock the card. Anybody?

On Jul 11, 2011, at 17:03 , P. J. Alling wrote:

Sure you don't have to worry about it, the camera thinks the card
is locked and won't write to it, nor will any properly designed
card reader.  I wish I could get large capacity MMC cards which
are just SD cards without a lock tab.  But there is no such thing
as a large capacity MMC card...



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