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qasdfdsaq last won the day on March 5 2016

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About qasdfdsaq

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  1. qasdfdsaq

    Seagate Archive HDD Review (8TB) Discussion

    022 is probably a newer revision of the base model (002). According to the spec sheet it uses 0.1w less poiwer. Some firmware tweaks and firmware level functionality bumps too, particularly for hosts that have SMR aware optimisations. Now that you mention it, there's quite a of new technical information in the manual for the 022 model. They appear to have published the exact shingling and non-shingled geometries: 1.0 Introduction These drives provide the following key features: • Host aware, optimized for SMR performance and capable of ZAC command support • High instantaneous (burst) data-transfer rates (up to 600MB per second). • Streaming video optimization - consistent command completion times & ERC support • Idle3 power mode support • TGMR recording technology provides the drives with increased areal density. • State-of-the-art cache and on-the-fly error-correction algorithms. • Native Command Queuing with command ordering to increase performance in demanding applications. • Full-track multiple-sector transfer capability without local processor intervention. • Seagate AcuTrac™ servo technology delivers dependable performance, even with hard drive track widths of only 75 nanometers. • Seagate SmartAlign™ technology provides a simple, transparent migration to Advanced Format 4K sectors • Quiet operation. • Compliant with RoHS requirements in China and Europe. • SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns. • Support for S.M.A.R.T. drive monitoring and reporting. • Supports latching SATA cables and connectors. • Worldwide Name (WWN) capability uniquely identifies the drive. 1.2 Zone Structure Archive HDD models use SMR (Shingled Magnetic Recording Technology), physically formatted containing two types of zones. 64 “Conventional Zones” which are not associated with write pointer, and the media is non-SMR and 29808 Sequential Write preferred Zones which are SMR media. For the sequential write referred zones there is a write pointer to indicated preferred write location. For the conventional zone writes can occur randomly for any block size. New commands which report zonal structure, resetting zonal write pointers, as well as managing zonal properties are available for sequential write preferred zones through ZAC commands. Archive HDD Conventional Zone Structure • There are 64 256 MiB Conventional Zones. (ie. Not Shingled) • The conventional zone is located at the outer diameter and is 16GB. • Sequential Read and Writes to this zones will perform at similar data rates. • Random Write commands can be issued in any order without any performance delay. • Zone designed specifically for random writes data. For example: logs and meta data. There are 29808 Sequential Write Zones • Each zone is 2e19 logical blocks in size or 256 MiB each. • Each zone is a shingled zone. • To achieve best performance use of ZAC commands is required. • Re-setting write pointers for each zone is required before reuse. Optimal number of open sequential write preferred zones • Advised - the largest number of zones that should be open for best performance, is reported in Identify Device Data log 0x30 page 0x00h Optimal number of non-sequentially written sequential write preferred zones • Advised - the largest number of write preferred zonesthat should be randomly written for best performance, is reported in identify device data log 0x30 page 0x00h T-13 standards define the new ZAC commands; REPORT ZONES EXT to query the drive on what zones exist and their current condition, RESET WRITE POINTER EXT to reset the write pointers, OPEN ZONE EXT, CLOSE ZONE EXT, and FINISH ZONE EXT to Open, Close, and Finish zones. To achieve optimal performance, an SMR-aware Host driver will need to write sequentially to all sequential write referred zones. See the T13 Web Site at for ACS-4, T13/BSR INCIT 529 for command details.
  2. qasdfdsaq

    SATA roadmap for laptop drives

    M.2 all the way. Sure mSATA SSDs will still be available in 10 years, just as IDE drives are still available now... but at very limited sizes and a hefty price premium. M.2 does everything mSATA (and mPCIe) does and more, so it's going to be an all-out replacement.
  3. Should be perfectly fine. No different to using two different drives inside a PC.
  4. qasdfdsaq

    Samsung 850 PRO SSD 2TB Review

    I'd agree for a business critical server I'd be a bit more conservative but can't see a big issue with them in a RAID-6. I've personally never ever seen a 2.5" SSD fail due to flash wear-out in actual use. If you can find a better enterprise SSD in a similar price range, by all means go for it, but with a 10-year warranty the 850 Pro's aren't half bad either. You may well get better reliability out of these than some cheap "enterprise" or "server" SSDs from other manufacturers.
  5. Well you didn't say you were after the 2TB specifically. You're right, lots of places have the 4T in stock but not the 2TB. There's clearly a global shortage on those though, nothing to do with the UK. Most places in the US list it as out of stock and/or 28 day lead time as well. Only two of the top 10 US sellers have more than one unit of any type in stock.
  6. No, I mean four. There's at least three on that page, and many major electronics retailers (Amazon, Ebuyer, Span, etc.) don't list on Google Shopping. At least two of them have it in stock too. Me neither, but it took me five seconds to find three places selling it, and another 5 minutes to find ten more. Admittedly, not a huge number, but not what I'd call "almost unobtainable" either.
  7. Slightly different firmware optimisations and lower performance on the NAS drive, supposedly, but it's much of a muchness. I'd go for whatever's cheaper.
  8. qasdfdsaq

    When can we expect 8TB 7200rpm drives?

    I'm sorry to hear that. Perhaps I'll have to rethink my strategy then. Looks like I was wrong. Very very wrong.
  9. Huh? I see plenty of sources, including shops that have had it since September last year ... Newegg UK don't exist, it's just a subset of Newegg US products that can be shipped internationally.
  10. Given your performance scales down almost linearly with block size this looks like a storage stack/driver/adapter optimization problem. The disk is obviously capable of reaching full speed under the right conditions, so I'd start looking through iostat -x to see where the bottlenecks are happening. Also, is write caching on? P.S. Please don't cross-post the same question in multiple threads. Yet it's 100% sequential.
  11. qasdfdsaq

    Samsung 850 PRO SSD 2TB Review

    Yes. They can. Whether or not they should is really dependant on your environment.
  12. qasdfdsaq

    When can we expect 8TB 7200rpm drives?

    I dunno, possibly 2 years, possibly never. Right now there's no real way to get any 8TB 3.5" drive without using exotic workarounds (SMR, Helium, HAMR, etc). Since you've already Helium is too expensive and SMR is too slow, your last option is to wait for HAMR which Seagate says are 2-years away from mass production and 1st gen drives won't fit normal drive bays. Also not sure about the 2-year warranty, last I recall when Seagate ditched the 5 year warranties everything went down to 1 year or 3 years. All my Seagate drives have 3-year warranties.
  13. Not bad, not bad. Now if only these innovations become more widespread I won't need to keep choosing my laptops to require a SD slot
  14. And the few you have, I've probably not read. Honestly, I've had very little interest in them in recent years, there just isn't a whole lot of point anymore. Performance is basically irrelevant since anything that requires performance gets an SSD. Of all my computing devices, everything has at least two SSDs in it and the only thing that even still has any HDDs left is my storage server. And even that has two SSDs for caching so the HDD performance is still irrelevant.