From: Dale <rdalek1967@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Re: problem formatting new 256 GB USB stick : glances at gparted
Date: Sat, 8 Mar 2025 16:48:29 -0600 [thread overview]
Message-ID: <35c4444d-446e-d9ca-7ead-8129c0d77595@gmail.com> (raw)
In-Reply-To: <Z8y_bMCNFWT1ffpk@q>
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Frank Steinmetzger wrote:
> Am Thu, Feb 20, 2025 at 11:40:48PM +0100 schrieb Frank Steinmetzger:
>
>> Another thing to consider: don’t put it into the safe for a year without
>> powering it up. As was explained in a previous mail, QLC uses sixteen
>> different levels of charge inside one single flash cell. The chance of a bit
>> flip increases the longer the SSD is powerless and charge slowly (very
>> slowly) dissipates. It’s hard to find exact numbers, and it’s more of a
>> statistical question. Could be a research topic for a slow Sunday. ;-)
>> Also, don’t you live in a hot area?
> I knew I’ve seen this data in the past, but couldn’t remeber where and in
> what context. I just stumbled upon the relevant info again.
>
> If you search for "jedec temperature and data retention" you find this PDF:
> https://www.jedec.org/sites/default/files/Alvin_Cox%20%5BCompatibility%20Mode%5D_0.pdf
>
> It contains establised standard values for flash durability. On slide 28 it
> says:
> Client-class SSDs should retain their data w/o power for 1 year if used
> 8 hours/day at 40 °C and kept at or below 30 °C when off.
> There is also a table for other temperatures; the time is cut in half for
> 5 degrees more.
>
> Mind you, that PDF is 15 years old, TLS had just been released to the public
> one year earlier according to https://en.wikipedia.org/wiki/Multi-level_cell#Triple-level_cell
>
> -- Grüße | Greetings | Salut | Qapla’ Please do not share anything
> from, with or about me on any social network. Some are so convinced,
> they don’t even know anymore of what.
That is confusing. Data should be OK for one year without power but
only if powered 8 hours per day. Me scratches my head. Maybe it means
should be OK for a year without power and not sure what to think about
rest.
I suspect that things have changed a lot in that time frame despite the
confusion. They may have improved things significantly since then.
Still, if the one year part, less the other part, is accurate then but
better now, then my powering up even once a month should be OK. I only
need to worry about if something happens to me and no one touches it for
many months, a year or longer.
I think some maker somewhere needs to repeat these tests and see how
things stand now. Then again, maybe the tech is changing so fast, they
can't keep up.
Time to update my backups again. :/
Dale
:-) :-)
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next prev parent reply other threads:[~2025-03-08 22:49 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-15 7:41 [gentoo-user] problem formatting new 256 GB USB stick Philip Webb
2025-02-15 11:50 ` [gentoo-user] " Nuno Silva
2025-02-15 13:31 ` Michael
2025-02-16 2:37 ` Philip Webb
2025-02-16 9:08 ` Nuno Silva
2025-02-16 13:41 ` Michael
2025-02-16 14:48 ` Wols Lists
2025-02-17 23:12 ` Frank Steinmetzger
2025-02-18 11:53 ` Michael
2025-02-19 12:10 ` Frank Steinmetzger
2025-02-20 9:58 ` Michael
2025-02-16 22:57 ` [gentoo-user] problem formatting new 256 GB USB stick : more info Philip Webb
2025-02-17 0:17 ` [gentoo-user] " Nuno Silva
2025-02-17 0:39 ` [gentoo-user] " Michael
2025-02-17 3:43 ` Philip Webb
2025-02-17 9:18 ` Philip Webb
2025-02-17 12:02 ` Michael
2025-02-17 16:33 ` Stroller
2025-02-17 16:19 ` Wols Lists
2025-02-17 17:16 ` [gentoo-user] " Grant Edwards
2025-02-17 18:12 ` Michael
2025-02-18 3:46 ` [gentoo-user] Re: problem formatting new 256 GB USB stick : f3 Philip Webb
2025-02-18 4:43 ` Grant Edwards
2025-02-18 5:53 ` Philip Webb
2025-02-18 9:13 ` Frank Steinmetzger
2025-02-18 19:10 ` [gentoo-user] Re: problem formatting new 256 GB USB stick : alternatives Philip Webb
2025-02-18 21:18 ` Grant Edwards
2025-02-18 23:25 ` Michael
2025-02-19 12:16 ` Frank Steinmetzger
2025-02-19 12:20 ` Frank Steinmetzger
2025-02-20 10:47 ` Michael
2025-02-18 14:40 ` [gentoo-user] Re: problem formatting new 256 GB USB stick : f3 Grant Edwards
2025-02-18 17:00 ` Grant Edwards
2025-02-18 11:57 ` Michael
2025-02-18 18:54 ` [gentoo-user] Re: problem formatting new 256 GB USB stick : glances at gparted Philip Webb
2025-02-18 23:13 ` Michael
2025-02-19 0:47 ` Grant Edwards
2025-02-19 1:12 ` [gentoo-user] alternatives to USB sticks for reliable archiving Philip Webb
2025-02-19 2:28 ` [gentoo-user] " Grant Edwards
2025-02-19 9:48 ` [gentoo-user] " Michael
2025-02-19 3:00 ` [gentoo-user] Re: problem formatting new 256 GB USB stick : glances at gparted eric
2025-02-20 18:18 ` Dale
2025-02-20 22:40 ` Frank Steinmetzger
2025-02-20 23:43 ` Grant Edwards
2025-02-21 8:10 ` Dale
2025-03-08 22:09 ` Frank Steinmetzger
2025-03-08 22:48 ` Dale [this message]
2025-03-09 10:31 ` Michael
2025-03-10 3:32 ` Dale
2025-03-10 13:01 ` Frank Steinmetzger
2025-02-17 16:38 ` [gentoo-user] problem formatting new 256 GB USB stick Stroller
2025-02-17 23:06 ` Frank Steinmetzger
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