Comment 32 for bug 670181

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petit-prince (petit-prince) wrote : Re: Dell Precision M6300 SD Card Reader (Ricoh R5C592 memory stick) Will Not Mount After Upgrade To 10.10

Can you try
sudo modprobe -r r852 ; sudo modprobe -r sdhci_pci ; sudo modprobe r852 ; sudo modprobe sdhci_pci
This was suggested in post #39 of bug #604122 and sounds like it might be worth a try.