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Rockbox mail archiveSubject: Re: Archos OndioRe: Archos Ondio
From: Jens Arnold <arnold-j_at_t-online.de>
Date: Sat, 23 Aug 2008 08:07:31 +0200 >> I recently purchased a very cheap Archos Ondio and want to >> get some extra memory for it. What is the maximum size >> Multimedia card it can take? > Definitely 2 GB is not the limit. We can use FAT32. The > question rather is: what's the largest MMC you can buy? > They're not as popular as SD, therefore lag behind. SD(HC) has Standard SD has a limit of 2GB. SDHC is specified for up to 32GB. The technical limit is much higher: SDHC uses block addressing instead of byte addressing. Therefore it's also not backwards compatible: an old SD card reader cannot read SDHC cards. > an architecture limit of 16GB (I think, or was it 32?). It may > not apply to MMC, but I doubt you can buy such as MMC. For MMC, things are similar. MMC3.x (and older) and MMC4.0/MMC4.1 use byte addressing, and are therefore limited to 4GB. MMC4.2 introduces block addressing, pushing the theoretical limit to 2TB (iiuc). As far as the Ondio is concerned, there are 2 modes of MMC operation to consider: When accessing the MMC slot via USB, the USB-MMC bridge chip handles the card. Since it doesn't talk MMC4.2, the limit in USB mode is 4GB, independent of the firmware. In normal operation mode, the limit depends on the firmware. Rockbox currently supports up to 4GB. MMC4.2 handling could be added, if I can get hold of such a card. The original firmware is limited to 1GB due to their limited blocksize handling. All that said, 8GB MMCs were announced 2 years ago by Samsung and Microdia, but are still not available. Regards, Jens ------------------------------------------------------------------- List admin: http://cool.haxx.se/cgi-bin/mailman/listinfo/rockbox FAQ: http://www.rockbox.org/twiki/bin/view/Main/GeneralFAQ Etiquette: http://www.rockbox.org/mail/etiquette.html Received on 2008-08-23 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |