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Home › Support › Why does my new Nokia smartphone not recognise the RS-MMC card from my old device?

Why does my new Nokia smartphone not recognise the RS-MMC card from my old device?

24 March 2006 · by Steve Litchfield
Series 60
Q. Why does my new Nokia smartphone not recognise the RS-MMC card from my old device?

A. From the Nokia 6630 onwards (up until the new breed of Series 60 v3 units, which use the physically different mini-SD format), Nokia smartphones have used the low-voltage (power saving) DV RS-MMC format.

DV RS-MMC cards look physically identical to the old RS-MMC cards, but work at both 1.8V in the smartphone and 3.3V in older devices and in PC card readers (hence 'DV', for 'Dual Voltage'). Thus a Nokia 6630/6680/6682/N70/N90 won't be able to read data on older 3.3V RS-MMC cards, although the reverse is true and older devices should be able to read newer DV RS-MMC cards.

There's a newer variant on DV RS-MMC, called MMCmobile, with extra connectors on the bottom for increased read/write performance. These are fully backwards compatible with all devices accepting DV RS-MMC.

Note that future Nokia smartphones (mainly S60 3rd Edition devices) use a completely different form factor, miniSD. Grrrr....