From mboxrd@z Thu Jan 1 00:00:00 1970 To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> In-reply-to: Your message of "Tue, 18 Nov 2014 20:29:30 GMT." <1a3157d28f8065b3a7072365eb88e464@hamnavoe.com> References: <1a3157d28f8065b3a7072365eb88e464@hamnavoe.com> Date: Wed, 19 Nov 2014 12:05:09 -0800 From: Bakul Shah Message-Id: <20141119200509.37711B827@mail.bitblocks.com> Subject: Re: [9fans] running plan9 : an ideal setup? Topicbox-Message-UUID: 2cbde328-ead9-11e9-9d60-3106f5b1d025 On Tue, 18 Nov 2014 20:29:30 GMT Richard Miller <9fans@hamnavoe.com> wrote: > > I can't think of any software fault that could wipe out so much of a > disk, with no respect for partition boundaries (the dos partition in > the first 64MB had not been mounted). But I also know too little about > the internals of SD cards to understand how they fail. Maybe some > internal logical-to-physical block mapping table went bad? One possibility: Many SD cards don't implement wear leveling. Without it, if the system is hitting some speicific blocks over and over again, the card will become unusable fast. I was using a $10 USB thumb drive as a boot disk for my FreeBSD based fileserver and forgot to mount it readonly (and unix syncs every 30 seconds to all r/w fs). It was toast within a year. On the raspi I've had good experience with the better quality SanDisk SD cards. I even have venti running on one for the past 6 months -- as an experiment, so I don't care if the card dies!