Post by NY Post by J. P. Gilliver (John) Post by slate_leeper
On Mon, 12 Mar 2018 16:43:46 +0000, "J. P. Gilliver (John)"
Post by J. P. Gilliver (John) Post by slate_leeper
The memory card from my Canon camera, when inserted into the computer,
is now permanently write protected. This means that I can not delete
Post by slate_leeper Post by J. P. Gilliver (John)
You haven't knocked the tab on the side of the card have you? Some types
of card have a mechanical switch.
Post by slate_leeper
Bingo. I didn't even know that was there. It was in the right position
but pushed just slightly off. Live and learn....
Glad to be of service! (Vmm.) Yes, they can get knocked out of position.
The worse situation is if the card goes write-protected as you are
putting it back in the camera. I've got into the habit of always
checking that I can take a test photo as soon as I replace the card
after copying data off it. Having the switch on the side, where it can
slide to the locked position as the card is being inserted, is a slight
I wonder how many people actually ever set the card to read-only and
would miss it if the feature was removed...
It's a continuation of features on more ancient storage media.
I have SCSI drives with a DIP switch bank on the drive, where
one of the switches is WP. It prevents writes to a SCSI data drive.
There have even been OSes that "tolerate" being read-only. Windows
isn't one of them.
Various floppy formats used to have density holes or
write protect sliders. The 1.44MB floppy in front of me,
has a slide switch for write protect.
The inclusion of such a feature on an SD, is just "copying"
the feature from history. It's of limited value in the real
world, because of the ease of moving the switch to the
other position, and overwriting the device. Of course,
with an SD, it also has a security suite, and that
could interfere with your fun too. I have no idea
what features it's got, where you would enter a password
and so on. But it got the name Secure Digital for some reason...
If ATA hard drives had a WP switch, I'd be in Heaven,
because it would mean I could install Windows on Drive X
and "switch off" Drive Y and Drive Z and know for a
fact that the MBR on Drive Y or Drive Z could not be
overwritten by the OS install. It's little known, that
if you switch off drives in the motherboard BIOS, it
makes no difference at all - an OS can switch them
on again. The beauty of WP switches, is they're electromechanical
and it's harder for shenanigans to happen. That's a feature
I miss, from having stopped buying SCSI drives.