Re: SSDs

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Sujet : Re: SSDs
De : chris.m.thomasson.1 (at) *nospam* gmail.com (Chris M. Thomasson)
Groupes : comp.arch
Date : 11. Jun 2024, 21:59:27
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v4adrg$16s3t$7@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
User-Agent : Mozilla Thunderbird
On 6/11/2024 1:20 PM, Stefan Monnier wrote:
It has to have a substantial amount of RAM in order to coalesce writes,
after applying all those remapping/wear leveling layers. This write-back
cache has a limited amount of dirty buffers, preferably low enough that they
can all be flushed to persistent storage in case of power loss.
 IIUC some don't have much RAM to speak of (they probably have some
on-CPU cache-size RAM, of course) and lend some DRAM from the host system
instead (accessed over PCI).  The technique is called HMB (Host Memory
Buffer), and it's apparently quite popular.
According to https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0229645
the HMB is used mostly for the remapping table, while the write buffer
used for coalescing is presumably some STL flash.
 
The main task however is that when first turned on, the CPU will run
a substantial amount of burn-in testing, and then decide how many flash
pages are actually usable.
 IIUC, another time-consuming task at startup can be to find the location
of the logical->physical mapping table (since it can't be written at
a fixed place in the flash, for wear-leveling reasons).
[ot] is there a way to create a flash disk that has the same protections as, say:
Dungeon Master
Technical Documentation - Copy Protection
http://dmweb.free.fr/?q=node/210

Date Sujet#  Auteur
24 Mar 24 * Another security vulnerability58Stephen Fuld
24 Mar 24 +* Re: Another security vulnerability4MitchAlsup1
25 Mar 24 i+* Re: Another security vulnerability2Stefan Monnier
26 Mar 24 ii`- Re: Another security vulnerability1Michael S
26 Mar 24 i`- Re: Another security vulnerability1Michael S
24 Mar 24 +* Re: Another security vulnerability10Lawrence D'Oliveiro
25 Mar 24 i+- Re: Another security vulnerability1Stefan Monnier
25 Mar 24 i`* Re: Another security vulnerability8Stephen Fuld
25 Mar 24 i `* Re: Another security vulnerability7Lawrence D'Oliveiro
26 Mar 24 i  +* Re: Another security vulnerability5MitchAlsup1
26 Mar 24 i  i`* Re: Another security vulnerability4Lawrence D'Oliveiro
27 Mar 24 i  i `* Re: Another security vulnerability3Stephen Fuld
28 Mar 24 i  i  `* Re: Another security vulnerability2Lawrence D'Oliveiro
28 Mar 24 i  i   `- Re: Another security vulnerability1MitchAlsup1
26 Mar 24 i  `- Re: Another security vulnerability1Michael S
25 Mar 24 +* Re: Another security vulnerability18Thomas Koenig
25 Mar 24 i+* Re: Another security vulnerability16Anton Ertl
26 Mar 24 ii+* Re: Another security vulnerability13Lawrence D'Oliveiro
26 Mar 24 iii`* Re: Another security vulnerability12Anton Ertl
5 Jun 24 iii `* Re: Another security vulnerability11MitchAlsup1
5 Jun 24 iii  +* Re: Another security vulnerability9Anton Ertl
11 Jun 24 iii  i`* Re: Another security vulnerability8MitchAlsup1
11 Jun 24 iii  i +* Re: Another security vulnerability6Stephen Fuld
11 Jun 24 iii  i i`* Re: Another security vulnerability5MitchAlsup1
11 Jun 24 iii  i i `* Re: Another security vulnerability4Stephen Fuld
11 Jun 24 iii  i i  `* Re: Another security vulnerability3Terje Mathisen
11 Jun 24 iii  i i   `* SSDs (was: Another security vulnerability)2Stefan Monnier
11 Jun 24 iii  i i    `- Re: SSDs1Chris M. Thomasson
11 Jun 24 iii  i `- Re: Another security vulnerability1MitchAlsup1
11 Jun 24 iii  `- Re: Another security vulnerability1MitchAlsup1
26 Mar 24 ii`* Re: Another security vulnerability2Anton Ertl
26 Mar 24 ii `- Re: Another security vulnerability1Anton Ertl
25 Mar 24 i`- Re: Another security vulnerability1Michael S
25 Mar 24 +* Re: Another security vulnerability22Anton Ertl
26 Mar 24 i`* Re: Another security vulnerability21Michael S
27 Mar 24 i `* Re: Another security vulnerability20Thomas Koenig
27 Mar 24 i  +* Re: Another security vulnerability2Thomas Koenig
27 Mar 24 i  i`- Re: Another security vulnerability1Thomas Koenig
27 Mar 24 i  +- Re: Another security vulnerability1Anton Ertl
27 Mar 24 i  `* Re: Another security vulnerability16Anton Ertl
27 Mar 24 i   `* Re: Another security vulnerability15MitchAlsup1
28 Mar 24 i    +* Re: Another security vulnerability4MitchAlsup1
29 Mar 24 i    i`* Re: Another security vulnerability3Paul A. Clayton
29 Mar 24 i    i `* Re: Another security vulnerability2Paul A. Clayton
30 Mar 24 i    i  `- Re: Another security vulnerability1MitchAlsup1
3 Apr 24 i    `* Re: Another security vulnerability10Stefan Monnier
3 Apr 24 i     `* Re: Another security vulnerability9Thomas Koenig
3 Apr 24 i      +* Re: Another security vulnerability6MitchAlsup1
4 Apr 24 i      i`* Re: Another security vulnerability5Thomas Koenig
4 Apr 24 i      i `* Re: Another security vulnerability4MitchAlsup1
4 Apr 24 i      i  +- Re: Another security vulnerability1MitchAlsup1
7 Apr 24 i      i  `* Re: Another security vulnerability2Paul A. Clayton
8 Apr 24 i      i   `- Re: Another security vulnerability1MitchAlsup1
5 Apr 24 i      `* Re: Another security vulnerability2Stefan Monnier
5 Apr 24 i       `- Re: Another security vulnerability1MitchAlsup1
25 Mar 24 `* Re: Another security vulnerability3John Savard
25 Mar 24  `* Re: Another security vulnerability2Michael S
26 Mar 24   `- Re: Another security vulnerability1Lawrence D'Oliveiro

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