Do you think "small one"s (1 TB is a "small one" these days!) will disappear altogether?
(What's Window 7's size limit for SSD/HDs?)
If I do decide to do some salting, is there any way to tell which models are using one- or two-bit cells (if that's the right terminology) and which three- or four-? Is the one you cameled ("SAMSUNG 870 EVO SATA III SSD 1TB 2.5” Internal Solid State Drive, Upgrade PC or Laptop Memory and Storage for IT Pros, Creators, Everyday Users, MZ-77E1T0B/AM") OK? Though it's £29.99 on Amazon UK, which is very tempting! But there's also another one with the same part number other than QVO instead of EVO, but that's £52.06 - is that better in some way, or does Q in the part number mean it uses the 4-level chips that are to be avoided and it just hasn't dropped in price?
https://semiconductor.samsung.com/us/consumer-storage/internal-ssd/870evo/
[near bottom, in "spec" section]
STORAGE MEMORY
Samsung V-NAND 3bit MLC <=== a violation of the naming scheme
The naming scheme would normally be:
SLC = 1 bit per cell (2 voltage levels for logic 0..1
MLC = 2 bit per cell (4 voltage levels for logic 00..11)
TLC = 3 bit per cell (8 voltage levels for logic 000..111) \__ Can get mushy,
QLC = 4 bit per cell (16 voltage levels for logic 0000..1111) <=== sensitive to threshold shift / need error correction inside
At one time, the claim was, the Samsung VNAND first-generation, had
relaxed spacing internally (22nm), which improved the behavior of the flash.
A lot of time has passed since that first gen, and it would be natural
for the 3 bit VNAND to be more TLC-like by now, on smaller geometry.
There is no one to track the geometry for us, and tell us just how
much of a misnomer this is now. So what we might watch for, is
"write speed inconsistency" as a sign of shenanigans. If you bought a
V-NAND NVMe SSD, and it did not write at a constant 3500MB/sec, you might
suspect you've been suckered. 3500MB/sec is related to the speed of a
certain PCI Express standard wire rate. Each gen goes (roughly) 2x faster.
You can improve the mushy characteristic, by silently re-writing data at
rest inside the drive, without flashing the LED. That's a firmware level
trick, that can be made almost invisible (stop doing background writes,
when user issues a command).
You can see from this, the situation is rife with opportunities for abuse.
Is there any _dis_advantage to "salting" for SSDs - do they deteriorate if unpowered? (For that matter, do spinners?)
NAND flash, could actually last forever... if it could be annealed. The
temperature for annealing, is too hot for the plastic package to take that.
NAND flash is "stressed" each time it is written. It is a floating gate technology.
A drive at rest, is not being stressed. A drive which is "mushy" from sitting
on the shelf at the store, can be freshened up, by writing from end to end.
Before you benchmark it and panic at the speeds seen.
The charge on the gate could leak off, but a tunneling (quantum mechanical)
mechanism was used to put the charge there in the first place. It's just
possible the leaking would be quantum mechanically disallowed or discouraged
(high energy barrier). The standard boiler plate, is the recorded bit is
there for a minimum of ten years. And could last longer. The NOR flash chip
in some PCs, some have had bit-rot, which is a sign the charge may have
leaked off some of them. Not all of them. That might have been at the 20 year mark.
The magnetic domains on a hard drive, are likely to be a bit more "stable" than
the charge on a NAND flash gate. One reason this might be evident, is the
servo wedges (a fixed written pattern on the surface), those magnetic domains
are never written again once a drive leaves the factor, and we have drives that
are easily 20 years old and still work (servo pattern successfully located) just
like the day they were made.
The motor on the HDD contains two drops of oil. That is our "precious resource"
inside a drive. If that oil were to disappear, the drive spindle seizes. One
poster reported, a drive was sitting on the floor, on some kind of rubber feet,
and when it seized while running one day, the sudden change in rotation caused
it to "hop" a tiny bit. The FDB motor is sealed, and is the motor type that
uses two drops of oil, for extended periods of operational life. Older drives
used ball bearings, where bearing wear caused increasing NRRO and noise. I have
four 9GB ball bearing drives, you can't sit in the room with the damn things,
for noise, yet the data is still on them. They will eventually become unreadable,
because the heads won't be able to track the wobbling inside.
Ditto, on the basis that the form factor and interface I might eventually
need won't be the one I've speculated on - they seem to change so often.
DDR5, puts two channels on a single DIMM, and this is meant to distract us
from the level of innovation at the bit level. But since hardly any good
tech articles are written about this stuff, it's hard to say whether DDR5 is
an "honest" generation or not. And we should pay extra for deck chair movement.
And yes, they alter the number of contacts, the keying slot, and so on, so
that you can't put them into the wrong hole.
Post by PaulIf and when Windows 11 storage slows down (after an "Upgrade" coming soon),
Have you heard there's some "up"grade coming that'll hammer storage? (As well as slowing it down, presumably it'll shorten the life too if SSD?)
I'll only know, if they tell us. All I can say, is I install updates to the
W11 Insider, and the delete speed (rate files are removed after placement and
flush of the trash), still seems slow. We know that $BITMAP is not properly
maintained any more, the $MFTMIRR can be corrupt, and some of these things
are potentially done, to reduce wear on SSD drives. The "thing" that detects
these anomalies, is older copies of Macrium.
Post by PaulDirectStorage.
The API might only be used for games. Intensive read. Could involve DMA into
video card. However, games have had compressed textures as a tech, for a lot
of years. The question would be, whether they will mess up operation
of anything else in the process.
https://www.pocket-lint.com/what-is-directstorage-and-is-your-pc-next-gen-ready/
Paul