From: William Pretty Security <bill.pre...@xplornet.com> Reply-To: "beagleboard@googlegroups.com" <beagleboard@googlegroups.com> Date: Thursday, July 17, 2014 at 7:58 PM To: "beagleboard@googlegroups.com" <beagleboard@googlegroups.com> Subject: RE: [beagleboard] Maximum SD card size for BBB
> Actually John, I¹ve been having that exact problem ! > > How does OEwear leveling¹ work ? > I have been using an external USB key as temp storage. http://en.wikipedia.org/wiki/Wear_leveling For development purposes, don¹t 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: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] On > Behalf Of John Syn > Sent: Thursday, July 17, 2014 10:32 PM > To: beagleboard@googlegroups.com > Subject: Re: [beagleboard] Maximum SD card size for BBB > > > > > From: William Pretty Security <bill.pre...@xplornet.com> > Reply-To: "beagleboard@googlegroups.com" <beagleboard@googlegroups.com> > Date: Thursday, July 17, 2014 at 6:51 PM > To: "beagleboard@googlegroups.com" <beagleboard@googlegroups.com> > Subject: RE: [beagleboard] Maximum SD card size for BBB > > >> >> Quite right, but given that Ubuntu with GUI is about 3GB, isn¹t 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: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] On >> Behalf Of John Syn >> Sent: Thursday, July 17, 2014 8:32 PM >> To: beagleboard@googlegroups.com >> Subject: Re: [beagleboard] Maximum SD card size for BBB >> >> >> >> >> From: William Pretty Security <bill.pre...@xplornet.com> >> Reply-To: "beagleboard@googlegroups.com" <beagleboard@googlegroups.com> >> Date: Thursday, July 17, 2014 at 4:14 PM >> To: "beagleboard@googlegroups.com" <beagleboard@googlegroups.com> >> Subject: RE: [beagleboard] Maximum SD card size for BBB >> >> >>> >>> You probably want about 8GB class 10 for sure. >>> I don¹t 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 aren¹t very reliable. >>> >>> http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book >>> >>> >>> From: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] >>> Sent: Thursday, July 17, 2014 6:05 PM >>> To: beagleboard@googlegroups.com >>> 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 beagleboard+unsubscr...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >>> >>> >>> >>> No virus found in this message. >>> Checked by AVG - www.avg.com <http://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 beagleboard+unsubscr...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >> >> >> No virus found in this message. >> Checked by AVG - www.avg.com <http://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 <http://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 beagleboard+unsubscr...@googlegroups.com. >> 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 beagleboard+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. > > > No virus found in this message. > Checked by AVG - www.avg.com <http://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 <http://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 beagleboard+unsubscr...@googlegroups.com. > 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 beagleboard+unsubscr...@googlegroups.com. > 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
