I am trying to follow the thread and am wondering for everyone's clarity: Can we clarify the mode of Reading and/or Writing modes for the claims of S= D Card access via SPI (and which PIC at what FOSC)? I would like to help and compare notes to the access times but want to make= sure that I am up to "speed"...... Thanks, David -----Original Message----- From: M.L. To: Microcontroller discussion list - Public. Sent: Sun, Jun 17, 2012 7:28 pm Subject: Re: [PIC] SD card & FAT On Sun, Jun 17, 2012 at 3:58 PM, Neil wrote: 50Mbits/sec in SPI mode, which seems like it would be much more than I need, so I can stick with SPI mode for now. I don't think that's correct. I, IIRC, have seen about 400 kbytes/sec nd others have verified this number. Still, it's much above your 1 bit/sec figure. --=20 artin K. -=20 ttp://www.piclist.com PIC/SX FAQ & list archive iew/change your membership options at ttp://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .