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SD card no response for CMD0

Question asked by Clament John on May 11, 2017
Latest reply on Jun 6, 2017 by AvaTar

A device I had been testing for over two months suddenly started giving FR_DISK_ERR (I'm using Elm Chan's FAT-FS) [Link]. When I tried debugging, the command (CMD0) which must be clocked in to set the SD card into SPI mode (as described in the SD card spec sheet - SDcard.org [link])  return 0xFF and not 0x01, i.e. it failed. 

My question is:

*If CMD0 fails does that mean the SD card controller is not working?

*Will it still work in SDIO mode even if CMD0 fails? (I couldn't test it as my uC does not support SDIO)

*Can an OS (Linux, Windows, Mac) format this SD card to make it working again? If so how does it do it?

--Linux's (I'm using Ubuntu) gparted was giving an error while it was trying to read the disk. I got an error "input/output error during read on /dev/sdb" Does this mean the SD card is a "gonner"/ never going to work?

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