Sparkfun microSD OK on my Uno, why not on my MEGA 2560?

Other Hardware Storage
1

I've been using microSD card successfully for many months but I'm stuggling to get my Sparkfun microSD to work on m MEGA 2560. I tested the card on a Uno using the Cardinfo example sketch, but with chipselect to pin 8 per Sparkfun directions, and it works just fine.
But when I try same on my MEGA, except with pin 53 set as the output for hardware SS, it never sees the card!
Any clues appreciated
TIA

2

I've been using microSD card

Which one?

But when I try same on my MEGA, except with pin 53 set as the output for hardware SS, it never sees the card!

The SPI pins are different on the Mega. You need to connect the SD reader to the Mega's SPI pins, not the Uno's SPI pins.

3

aha ... so 50,51,52 instead of 11,12,13 ?

4

correction, make that:

pin - Uno to MEGA

SS - 10 to 53
MOSI - 11 to 51
MISO - 12 to 50
SCK - 13 to 52

right ?

5

that fixed it - thanks