• Content Count

  • Joined

  • Last visited

  • Days Won


jtsn last won the day on November 28 2017

jtsn had the most liked content!

Community Reputation

5 Neutral

About jtsn

  • Rank

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. The simplest check for 16 byte commands is to boot Linux and check the kernel log. But you only need to do that if you don't have the drive size available for compatibility testing. If you already have an 8 TB drive, you simply check if that works or if it doesn't like in the example above. In the example above Windows sees the protection MBR, but is missing the GPT itself. This tells us that the USB docking station doesn't report the correct sector size (512e) and instead reports a different one (4096). This is an old workaround for USB enclosures, which can use up to 16 TB HDDs with 10 byte commands (but will still fail at any drive size above it). This won't work with drives formatted for internal use and drives formatted in this docking station won't work anywhere else, making it entirely useless for a HDD docking station intended to work with internal drives. It just shows, that those no-name China back-alley manufacturers with pseudo-brands like "Inatek" or "Salcar" don't really know what they are actually doing. And that is no surprise.
  2. jtsn

    Toshiba L200

    SMR is not a feature of the magnetic platter, but of the write head. The data on the media is always stored using PMR. It can be read back at full speed without going through any special processing. But once the areal density of those 1TB-2.5" platters is too high for the L200's write head to write a single track without overwriting neighboring tracks, it has to write using SMR. And that's exactly what the L200 drives with 128 MB RAM buffer do. To differentiate SMR drives from faster drives, the ones which can still write single tracks / sectors randomly, the latter are now called CMR (Conventional Magnetic Recording) drives. The L200 models with an 8 MB buffer are CMR drives.
  3. jtsn

    Toshiba L200

    You can actually tell from the buffer size, which model is PMR and which one is SMR. From https://www.toshiba-storage.com/products/toshiba-internal-hard-drives-l200 Buffer size 128 MB (1 TB Slim, 2 TB), 8 MB (500 GB, 500 GB Slim, 1 TB)
  4. jtsn

    Toshiba L200

    As long as the write load isn't too high, you shouldn't see any negative effects.
  5. Seagate ceased production of the Spinpoint M9T, so it is sold out on my local market. Anyway, none of the new 2 TB 2.5in drives is specifically advertised as "SMR". You simply buy one and then you find out you got a lemon. Additionally Toshiba's SMR implementation is worse than Seagate's. At least the 7mm Barracuda 2 TB doesn't already throw up with a bunch of 100 MB files thrown at it.
  6. It did, it uses device-managed SMR is not usable for anything except cold storage with command response times up to half a minute.
  7. jtsn

    Toshiba L200

    I was able to reproduce the behavior the HDD showed in the PS4, while having it connected to a PC via USB, after formatting it with exFAT. Wasn't too hard and it has nothing to do with drive temperature. It copes pretty well with linear writing of large files, but nothing else. First I wrote 800 GB file filled with zeros to the drive at roughly 100 MB/s at a stable 44 °C while writing for over two hours. Good and what you expect from a 2.5in drive. Then I kept the file on the drive an started writing lots of 100 MB files (filled with zeros, too). Such large files shouldn't be too hard for a 5400rpm HDD to handle. This is not a overlapped 4K test and exFATs block size is 128K. After a few GBs written at 100 MB/s, write performance drops down to almost zero. After each cache flush by the OS, the drive takes tens of seconds to respond to new commands. In the most extreme cases I had to wait half a minute to access a directory or read a different file from it while the drive carried out a write command at the same time. During the pauses the drive is still active (audibly). So it's obvious what's happening here. It took over half an hour to write 500 100 MB files, which roughly equals 1666 MB/min or 27 MB/s - typical for drive-managed SMR. Conclusion: The 2 TB 9.5mm drive most likely uses some kind of drive-managed SMR and is unfit for general usage.
  8. jtsn

    Toshiba L200

    It might be the case that the L200 is an SMR drive too, and just hiding it better. I have no explanation, why writing 50 GB takes just over 8 minutes on a HGST 1 TB drive, while it takes 15 minutes on a higher density Toshiba L200. Or it might be just write throttling to prevent the drive from overheating. It seems that the M9T is the last "normal" 2 TB 2.5in drive available in the market.
  9. That's what you get for posting in a ghost town. Doesn't change anything about SSHDs though, my opinion still stands.
  10. jtsn

    Toshiba L200

    At least it didn't lock up and corrupt the OS irrecoverably under high temperatures / high write load like some 2.5"-SMR drive did for me. The Toshiba L200 2 TB drive works fine when inside the tray-less mobile rack of my PC. With proper cooling temperatures range from 29-43 °C depending on load. SMART states the drive can work up to 60°C, which seems not so true in practice. I think, it will work fine inside an aluminum enclosure. Somehow HGST knows some military-grade magic, the other manufacturers don't have. Their drives generate less heat, even at 7200 rpm, they work reliable at extreme temperatures*) and they have an astonishing low failure rate. They're just stopping at 1 TB for the 2.5" 9.5mm form factor (The Travelstar 5K1500 isn't sold anymore), which is 1 TB less of what I need. *) HGST once sold me an 3.5" 2TB DeskStar 7K2000 7200rpm 5-platter drive times inside an USB enclosure. Drive was cooking with up to 65-70°C when loaded, idling at 50-55°C. I was worried first, but ten years later that noisy brick still works just fine.
  11. jtsn

    Toshiba L200

    So I just tested a Toshiba L200 inside a PS4. Connected to a PC sustained read performance is great for 5400 rpm, topping at 150 MB/s, also the drive happily writes hundreds of GB sustained at up to 140 MB/s. However inside a PS4 as any high density drive with many platters it struggles with high temperatures (drive logged up to 55°C). Once it reaches operating temperature, sustained write performance tanks, with the drive taking seconds-long thinking pauses. All this despite the PS4 barely touching half of the maximum sustained write rate (under optimal conditions it reads and writes the internal hard drive at about 5 GB/min through its internal USB-SATA interface). So the HGST TravelStar 7K1000 (which doesn't care about temperatures) goes back into the console and the L200 is going to become another external drive.
  12. Hybrid SSHDs are only made to hit a certain price point for notebook OEMs, who like to see some quick OS boot up time, when the device is new. From the technical POV a 500 GB hybrid drive doesn't make any sense, as 500 GB SSDs are totally viable both technically and economically. Even in retail a 500 GB SSD costs just slightly more than a Toshiba MQ02ABF050H and a 250 GB SSD is cheaper even. Hybrid drives would make sense at capacity points above 2 TB, but HDD manufacturers ran out of physical space in the 7mm department. Suggestion: Don't buy a notebook with a pre-installed SSHD, go for the cheapest HDD option, then swap the drive with an aftermarket SSD of your choice.
  13. Interesting pattern, but if the firmware doesn't fool me, write performance looks fine so far, averaging at about 130 MB/s for the outer 100 GB. Drive identifies itself as Toshiba HDWL120.
  14. I have a Toshiba L200 (2 TB, 9.5mm, about 80 € incl. VAT) here now, too. According to Toshiba it doesn't feature SMR. I'm running a 100 GB write test now to compare it to the atrocious performance I got from the Seagate 2TB SMR drive (in the range of 30 MB/s).
  15. jtsn

    Toshiba L200

    Game consoles still care. They have 9.5mm 2.5in drive bay and can't make use of SSD speeds, so the latter are a waste of money.