1 Feb
2023
1 Feb
'23
1:52 a.m.
On Tue, Jan 31, 2023, 6:44 PM Paul Koning <paulkoning(a)comcast.net> wrote:
which
They are on the "copy it every so often" end of things. Especially if they
were slow when released.
Warner
On Jan 31, 2023, at 8:38 PM, Warner Losh via
cctalk <
cctalk(a)classiccmp.org> wrote:
On Tue, Jan 31, 2023, 5:03 PM Ali via cctalk <cctalk(a)classiccmp.org>
wrote:
>> I thought Flash could only hold the data in them X amount of years
>> until
>> the junctions discharge or whatever? It's less permanent than decent
>> quality optical or pro magnetic media?
>
>> You have to plug them in every so often to refresh I believe.
> Does REFRESHING mean reread and rewrite or just keep power to it? If
it's
> the latter it should be trivial to setup a
system with backup battery
just
to supply
voltage to a bunch of SSD drives.
It depends on the drive's firmware. Some do background scans of blocks
while idle. Others do not. Since you have no way of knowing which is
(or even when the backgroundscan is done), the
safest way to force a scan
is to read the whole drive... any blocks whose raw error count is too
high
will be rewritten to fresh blocks. If it's a
good SSD you'll likely not
notice this happening. If it's a crappy thumb drive... you may be better
off copying to some other media..
Warner
Do you know what the likely answer is for "memory sticks", SD or MicroSD
cards, things like that? I assume their firmware is tiny, so are they
likely to need active refreshing?