Date: Sat, 23 Feb 2019 13:47:09 -0600 From: Valeri Galtsev <galtsev@kicp.uchicago.edu> To: freebsd-questions@freebsd.org Subject: Re: Recover failed SD card Message-ID: <d5a35ea2-4730-1244-7448-8effa8aca8d8@kicp.uchicago.edu> In-Reply-To: <2341a9ac-42aa-737e-441f-b69cccc826c6@netfence.it> References: <2341a9ac-42aa-737e-441f-b69cccc826c6@netfence.it>
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On 2/23/19 10:50 AM, Andrea Venturoli wrote: > Hello. > > A customer of mine gave me an SD card which is quite surely failing. > I'm trying to recover what I can. > > > > I first tried using an USB based reader: altough the SD card should be > 4GB in size, dd just copies 121MB. So does recoverdisk. > "camcontrol readcap /dev/da3" gives: >> Last Block: 248319, Block Length: 512 bytes > which agains means about 121MB. > > I put the card in another box and i get: >> mmcsd0: 127MB <SD 0.0 SN 00000000 MFG 00/0000 by 0x0000> at mmc0 >> 0.4MHz/4bit/65535-block > > > > Is there any way I can get beyond this 121-127MB limit and read what I > can of the rest? > I looked into camcontrol's man page, but came up with no idea. I would be sceptical about that. The card is a single chip, not even a printed circuit board, so whatever the failure it is it is inside the chip (read: integrated circuit). Yet, out of desperation, I would try what we did with failing printed circuit boards: put it for some time in a freezer (say for 20-40 min), take it out and try to read again. Heat moderately, I would say to about 90 C (for about 20-40 min), and try to read it again. Next step is paid recovery services, with those stay away from the ones who charge even for "taking a look", use only those who charge if they recover most of the stuff. These will be expensive, expect to pay $500 - $1000. Ask me off the list which ones I know are good just by someone's I know experience. The cases I know of were hard drives, but some of them may work with Flash devices as well. Good luck! Valeri > > The card should hold pictures, so I could go ahead with photorec once I > got an even partial image. > > bye & Thanks > av. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" -- ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
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