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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 29 Dec 2018
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      So this HDD died a couple weeks ago, just got around to looking at it... >Warranty Expired December 27 2018 Lovely.

      8 replies 12 retweets 150 likes
      Show this thread
    2. Hector Martin‏ @marcan42 29 Dec 2018
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      I think I found the problem.pic.twitter.com/IkeksBEwd6

      14 replies 7 retweets 65 likes
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    3. Hector Martin‏ @marcan42 29 Dec 2018
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      At least I get a shiny souvenir out of it. As far as I know this is the first unprovoked head crash of an HDD I own.pic.twitter.com/BY3JevRvuD

      3 replies 1 retweet 28 likes
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    4. Hector Martin‏ @marcan42 29 Dec 2018
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      Since it's now a display piece, let's take some macro photos of the head stackpic.twitter.com/tGtGEltlz0

      Top view of business end of HDD head with piezo actuators towards the right side.
      Solder joints between individual head micro-flex wiring and the shared pre-amp IC for all 4 heads mounted on standard flex PCB.
      Top view of piezo actuators.
      Top view of HDD head with wiring flex off to either side
      2 replies 3 retweets 29 likes
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    5. Hector Martin‏ @marcan42 29 Dec 2018
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      Looks like it uses piezo actuators for fine positioning?pic.twitter.com/rmot8gVNrV

      Bottom view of HDD head showing read/write head element.
      Bottom view of piezo actuators showing connnections and flex wiring from the head.
      Angle view of the HDD head, showing rectangular read/write head unit mounted on metal arm.
      Oblique angle view of the HDD head.
      2 replies 2 retweets 21 likes
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    6. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 29 Dec 2018
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      Replying to @marcan42

      Huh, neat. I wouldnt have been surprised by piezo buzzers for vibration cancellation, but I had never thought about the need for vertical positioning. It makes sense, though.

      1 reply 0 retweets 0 likes
    7. non-standard nerd, ¬ 🆗‏ @brouhaha 29 Dec 2018
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      Replying to @hedgeberg @marcan42

      AFAIK they're not used for that. In high-performance drives, they are used to achieve more precise track positioning than the voice coil positioner, and to provide faster seeks within a very limited range of the voice coil position.

      2 replies 0 retweets 0 likes
    8. non-standard nerd, ¬ 🆗‏ @brouhaha 29 Dec 2018
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      Replying to @brouhaha @hedgeberg @marcan42

      Possibly needed in all drives with track density beyond a certain limit? I don't know.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 29 Dec 2018
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      Replying to @brouhaha @hedgeberg

      What I'm wondering is if they have per-head positioning now, what's stopping them from using all heads in parallel for throughput? As long as the piezo has a range >= the long-term/thermal mechanical stability of the rest of the system it should work, right?

      11:46 AM - 29 Dec 2018
      1 reply 0 retweets 0 likes
        1. non-standard nerd, ¬ 🆗‏ @brouhaha 29 Dec 2018
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          Replying to @marcan42 @hedgeberg

          AFAICT that should be viable. Possibly the drives don't currently have electronics for independent per head 2nd stage positioner drive, and for simultaneous servo tracking for multiple heads. That should just be a small matter of more logic in the ASIC and more piezo drivers.

          0 replies 0 retweets 0 likes
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