SD init fail

Spent some time looking for a possible solution for the SD card init fail problem. many people seem to have had this problem but I could not find a reported 'solution' that worked for my card with this problem.

I have two 2GB SD cards, these are actual SD cards and not TF cards in an adapter, the first is a Sandisk and the second is a Kingston. It is the Kingston that fails 'init' and it fails every time - sending M21 does not help, it still fails, and this is with slow SD support enabled. The Sandisk works fine - every time. I have tried two separate printers, both RAMPSv1.4 with full graphics controllers fitted, the results are identical on both printers so it is not a printer hardware fault.

I have re-formatted the cards using the official SD card formatter, employing full overwrite, formatting to fat16 without change to the fault.

There is however, a substantial difference between the cards in that when writing to the Sandisk with H2test.exe the average write speed is 5.57Mb/s but the best the Kingston can achieve is 2.08Mb/s

So there we have it (probably)....the Kingston works fine in a PC and in my camera but not in the printers.....too slow......

This probably won't help but... If using marlin there are options to run spi at half or quarter rate for sd cards. One machine I had would only work from sd at spi half rate. Worth a try?

Ah I see you've tried slow sd, maybe it's the cards I had two that refused to work in a rearm, but work fine generally.

Edited 1 time(s). Last edit at 04/08/2017 02:16PM by DjDemonD.

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Simon Khoury

Co-founder of [www.precisionpiezo.co.uk] Accurate, repeatable, versatile Z-Probes
Published:Inventions

I guess that it is just too slow.. a 2GB SD card is quite antiquated by todays' standards. I'll just chuck it away and use a tf card!!