1. Chris Mellor 1

    TLC NAND is coming

    From Micron's Q3 2012 earnings call: "We also began sampling 20-nanometer TLC components with controller companies in Q3 with production expected next quarter."

    TLC was about 9% of Micron NAND sales in the quarter.

    At least one controller company is shipping TLC flash product to GreenBytes. The dratted stuff is coming ; I can smell it.

  2. Outcast !!!
    Thumb Down

    This explains it...

    Which is why Seagate warranty now comes with a year only!

  3. Chris Mellor 1

    Discussing TLC and write amplification

    How about this thought: "50 full writes/cycles per day for 5 years does not necessarily translate to 89,000 P/E cycles. Please place close attention to the user/flash capacity ratio difference between this drive and the regular Optimis and Ultra. You will see that this ratio is reduced while the number of writes/day increases. This is because the WA is reduced as over-provisioning increases. I calculated the WA for the regular Optimus drive to be 2.58, while Ultra is 1.38 and Ultra+ is 1.03. Over-provisioning ((flash capacity-user capacity)/user capacity) is 28%, 71%, and 156%, respectively. The endurance required in all cases is about 37k cycles. User capacities start at 200GB, 150GB, and 100GB, for Optimis, Ultra and Ultra+, respectively."

    1. Anonymous Coward
      Anonymous Coward

      Re: Discussing TLC and write amplification @CM 1

      Oh 'cmon! What are you getting at here? Give the rest of us poor sods a chance.

  4. This post has been deleted by its author

  5. Nigel 11


    Wouldn't it be better to combine SLC and TLC? Write data to SLC first and then have the controller move it to TLC once the data has stayed unchanged for a sensible length of time. Unlike RAM cacheing, no loss if the power suddenly vanishes, no big(gish) backup battery needed to prevent that.

    Would it be possible to bake a combined SLC + TLC chip or are the processes different?

  6. Toastan Buttar

    SLC & TLC on the same chip?

    Each block in a NAND Flash die can be formatted as either SLC or TLC. The SLC blocks are used for the important stuff like firmware storage and FATs. The TLC-formatted blocks are then used for general user file storage.

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