Author Topic: SLC, TLC or DRAM modules  (Read 305 times)

Offline OS923

  • Silver Member
  • ****
  • Posts: 201
    • OS 9.2.3
SLC, TLC or DRAM modules
« on: November 03, 2017, 07:49:31 AM »
I just started reading about SSDs. I saw that there's a big difference between SLC and TLC, that most current SSDs are TLC and that TLC is slower and more crash-prone.

I also read about SSDs with DRAM modules and although they lose all data when the power is cut, I found them more interesting, since I use an UPS anyways. They have the advantage of unlimited rewrite, but they use more electricity.

The SSDs that are usually discussed here, are these SLC or TLC?
Has anyone here ever run OS 9 with an SSD with DRAM modules?

Offline Jubadub

  • Active Member
  • **
  • Posts: 18
  • New Member
Re: SLC, TLC or DRAM modules
« Reply #1 on: November 05, 2017, 03:39:06 PM »
Some years ago I checked a few articles on that, and here's some parts of a series on them, on the durability of SSD:

http://techreport.com/review/24841/introducing-the-ssd-endurance-experiment
http://techreport.com/review/26523/the-ssd-endurance-experiment-casualties-on-the-way-to-a-petabyte
http://techreport.com/review/26523/the-ssd-endurance-experiment-casualties-on-the-way-to-a-petabyte/2
http://techreport.com/review/27909/the-ssd-endurance-experiment-theyre-all-dead

They don't answer all your questions yet, but I really think you might find some information in them useful or relevant.

Offline OS923

  • Silver Member
  • ****
  • Posts: 201
    • OS 9.2.3
Re: SLC, TLC or DRAM modules
« Reply #2 on: November 08, 2017, 04:39:01 AM »
Fortunately, they all issued SMART warnings before their deaths.

Offline Astroman

  • Consistant Contributor
  • ***
  • Posts: 72
  • new to the forums
Re: SLC, TLC or DRAM modules
« Reply #3 on: December 04, 2017, 03:09:16 AM »
my workhorse USB pendrives are some old Buffalo 8 and 4 GB sticks that still work.
They are SLC and were extremely expensive ($150 for the big one back then), but worth the cash.
I have some 1GB industrial 'disk on modules' as OS-9 boot devices, also SLC and 2 8GB Sata as SLCs (Transcend), one adapted in a Mac G4 Cube.
Imho they might be more 'secure' in a non-ssd-supporting OS, disk management is crucial on such drives - the data lives in software literally.

Performance isn't outstanding, but the drives are silent and faster than their mechanical counterparts anyway. You don't experience the same effect as in current desktop models.
Probably there are timing constraints in the disk driver software of the classic MacOS.

Which even more applies to DRam based systems.
I have one as a PCIe card in Windoze-7 box, but it's lightyears behind it's performance capabilities in regular desktop use.
Needs a server-app to drive it to it' limits, otherwise it's just a fast disk.