A card reader should be able to read cards irrespective of what it senses about the write protect switch.criticalfungus wrote:A long shot but just have a check, I noticed my RasPI had shaved the plastic from the top left corner (next to the gold contacts and the write protect tab) of my SD cards.
They work fine in my PI but on the PC it can't read them. Not sure why exactly but think its to do with the detection of the write protect notch on the card. As far as I'm aware write protection detection has not been implemented on the PI but is in place on your PC card reader.
I had to dismantle a USB SD Card reader and short the two pins responsible for this detection together (more luck than judgement I just aimed for the two pins closest to the damaged corner, if you try this be it on your head) on the SD card slot.
Using this reader my PC can work with the physically damaged cards ok.
Agreed, but for some reason (to be honest I don't know what) there appears to be some form of sensing switch in that corner of the SD Card reader, which appears to be the write protect sensing switch. Of the readers I have access to 3 out of 4 cannot detect the card at all. I'm assuming the missing plastic is stopping that sensing switch being triggered. Bizarrely however by shorting together those pins on my butchered SD Card reader (not tried it with the others) it detects there is a card in place and allows me to use the damaged SD card.drgeoff wrote: A card reader should be able to read cards irrespective of what it senses about the write protect switch.
I'm using Linux (with dd command) for installing my SD cards, and I have checked the cards after installing the images!drgeoff wrote:I've read many posts about 'non-booting' RPis but never one saying that it crashed SD cards and made them unrecognisable by PCs.
How did you load Raspian on to your cards? Did you check that after you had loaded Raspian, the cards were still recognised by Windows?
Have you tried using the official SD card formatter at https://www.sdcard.org/downloads/formatter_3/ ?
What power supply are you using with your RPi?
I'm not ignoring your reply, just not had time to try it (means getting into the pibow, never undertaken lightly!) - I'm pretty sure that's not the issue here but I'm willing to give it a go.borosa wrote: Could you humor me and just give the gold fingers in the SD card slot a clean for me with a cotton bud and some methylated spirits....