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From: Lukasz Majewski <lukma@denx.de>
To: linux-mtd@lists.infradead.org
Subject: Problem with NAND memory data retention
Date: Thu, 27 Apr 2017 12:25:02 +0200	[thread overview]
Message-ID: <20170427122502.285d16ba@jawa> (raw)

Dear All,

I'd like to ask you for sharing your experience with NAND Flash devices
- which may be older that their data retention time.

I've a problem with Flash NAND memory (Samsung 128Mx8).

In the data sheet [1] the manufacturer claims that it has 10 years for
data retention. The device equipped with it is a bit older than 10
years.


How one can diagnose that data retention time for NAND Flash has been
exceeded?

Is that:

- The number of bit flip errors on a RW page so large that ECC cannot
  fix it?

- Or are whole RW pages erased (0xFF)/corrupted/cleared (0x00)?

- Or any other evidence?


Thanks in advance for your help.


[1] -
http://www.sst-ic.com/File/Seriea/PDF/100923163334f47b2ce6-13b7-43d0-9b8c-ec1c75ca2c6f.pdf


Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de

             reply	other threads:[~2017-04-27 10:25 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-27 10:25 Lukasz Majewski [this message]
2017-04-27 10:54 ` Problem with NAND memory data retention Ricard Wanderlof
2017-04-27 13:04   ` Lukasz Majewski
2017-04-27 13:13     ` Andrea Adami
     [not found]     ` <CAAQYJAtBGn_-8z-1NQbVYPiVm6W3zquibLK9jutWWKGn0RBWuQ@mail.gmail.com>
2017-04-28  8:36       ` Lukasz Majewski

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