As I understand , its not about the size , its about the eMMC spec support ,
While sdhc up to support 32G card , the new spec call sdxc ? this will support up to 2T , but this is not support by ti omap3/dm81xx/am335x ,only support by omap5 So , when you see a card with sdxc trademark. it should NOT support by beagle .even its less than 32G 2014-07-19 7:09 GMT+08:00 Eric Fort <[email protected]>: > I'm using a 32GB SD card, so yes it works. Has anyone tried 64GB and > larger cards yet? 64 or 128GB would be insanely nice! > > Eric > > > On Fri, Jul 18, 2014 at 12:04 PM, William Hermans <[email protected]> > wrote: > >> We use two BBB's here, and both use 16GB class 10 cards. I've heard that >> 32GB works too, but no hands on. >> >> AS john said first you want more space( unused, or free space ) on your >> sd card to help facilitate wear leveling, *AND* if you're going to be doing >> lots of writing for development purposes. Move your rootfs to an NFS share. >> >> >> On Fri, Jul 18, 2014 at 3:05 AM, William Pretty Security < >> [email protected]> wrote: >> >>> Thanks John J >>> >>> >>> >>> >>> http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book >>> >>> >>> >>> *From:* [email protected] [mailto: >>> [email protected]] *On Behalf Of *John Syn >>> *Sent:* Thursday, July 17, 2014 11:48 PM >>> >>> *To:* [email protected] >>> *Subject:* Re: [beagleboard] Maximum SD card size for BBB >>> >>> >>> >>> >>> >>> *From: *William Pretty Security <[email protected]> >>> *Reply-To: *"[email protected]" <[email protected] >>> > >>> *Date: *Thursday, July 17, 2014 at 7:58 PM >>> *To: *"[email protected]" <[email protected]> >>> *Subject: *RE: [beagleboard] Maximum SD card size for BBB >>> >>> >>> >>> Actually John, I’ve been having that exact problem ! >>> >>> >>> >>> How does ‘wear leveling’ work ? >>> >>> I have been using an external USB key as temp storage. >>> >>> http://en.wikipedia.org/wiki/Wear_leveling >>> >>> >>> >>> For development purposes, don’t use SDCards. Rather use NFS to mount a >>> rootfs on your desktop. >>> >>> >>> >>> In the field, use a read only rootfs and create a separate partition for >>> storage. Flash has to erase a block before writing a byte. If you have a >>> logging application, create a buffer in ram which is the size of your flash >>> erase block and write data to buffer and only write the buffer to disk when >>> the buffer is full. Alternatively, use a power fail detection circuitry and >>> only write to SDCard on power failure. There are a lot of techniques like >>> this that prolong the life of flash. >>> >>> >>> >>> Regards, >>> >>> John >>> >>> >>> >>> Bill >>> >>> >>> >>> >>> http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book >>> >>> >>> >>> *From:* [email protected] [ >>> mailto:[email protected] <[email protected]>] *On >>> Behalf Of *John Syn >>> *Sent:* Thursday, July 17, 2014 10:32 PM >>> *To:* [email protected] >>> *Subject:* Re: [beagleboard] Maximum SD card size for BBB >>> >>> >>> >>> >>> >>> *From: *William Pretty Security <[email protected]> >>> *Reply-To: *"[email protected]" <[email protected] >>> > >>> *Date: *Thursday, July 17, 2014 at 6:51 PM >>> *To: *"[email protected]" <[email protected]> >>> *Subject: *RE: [beagleboard] Maximum SD card size for BBB >>> >>> >>> >>> Quite right, but given that Ubuntu with GUI is about 3GB, isn’t the >>> other 13 kind of a waste ?? >>> >>> Flash has a finite number of writes so with wear leveling, you want to >>> have a much free space as possible to prevent flash failure. If it is the >>> same price, always get the bigger one ;-) >>> >>> >>> >>> Regards, >>> >>> John >>> >>> >>> >>> >>> http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book >>> >>> >>> >>> *From:* [email protected] [ >>> mailto:[email protected] <[email protected]>] *On >>> Behalf Of *John Syn >>> *Sent:* Thursday, July 17, 2014 8:32 PM >>> *To:* [email protected] >>> *Subject:* Re: [beagleboard] Maximum SD card size for BBB >>> >>> >>> >>> >>> >>> *From: *William Pretty Security <[email protected]> >>> *Reply-To: *"[email protected]" <[email protected] >>> > >>> *Date: *Thursday, July 17, 2014 at 4:14 PM >>> *To: *"[email protected]" <[email protected]> >>> *Subject: *RE: [beagleboard] Maximum SD card size for BBB >>> >>> >>> >>> You probably want about 8GB class 10 for sure. >>> >>> I don’t know if there is a maximum size of uSD card. >>> >>> 16GB is about the same price as 8GB. At Amazon, 16GB class 10 is about >>> $8. >>> >>> >>> >>> The class 4 uSD cards aren’t very reliable. >>> >>> >>> >>> >>> http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book >>> >>> >>> >>> *From:* [email protected] [ >>> mailto:[email protected] <[email protected]>] >>> *Sent:* Thursday, July 17, 2014 6:05 PM >>> *To:* [email protected] >>> *Subject:* [beagleboard] Maximum SD card size for BBB >>> >>> >>> >>> Greetings everyone, >>> >>> What is the maximum size SD or SDHC flash memory card that the >>> "BeagleBone Black" will support ? >>> >>> Also, what is the recommended speed class (e.g. Class 4, Class 10, etc.) >>> ? >>> >>> Thank you in advance for your help :-) >>> >>> Jonmar >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> >>> >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2014.0.4716 / Virus Database: 3986/7869 - Release Date: 07/17/14 >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> ------------------------------ >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2014.0.4716 / Virus Database: 3986/7863 - Release Date: 07/16/14 >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2014.0.4716 / Virus Database: 3986/7871 - Release Date: 07/17/14 >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> ------------------------------ >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2014.0.4716 / Virus Database: 3986/7863 - Release Date: 07/16/14 >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2014.0.4716 / Virus Database: 3986/7871 - Release Date: 07/17/14 >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> ------------------------------ >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2014.0.4716 / Virus Database: 3986/7863 - Release Date: 07/16/14 >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2014.0.4716 / Virus Database: 3986/7871 - Release Date: 07/17/14 >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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