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systems:harddrive [2015/05/29 17:08] – [Western Digital WD VelociRaptor] superwizardsystems:harddrive [2017/04/29 03:55] (current) – superwizard
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 +====== Raid Reliability ======
 +
 +From: https://www.servethehome.com/raid-calculator/raid-reliability-calculator-simple-mttdl-model/
 +
 +<code>
 +It took a lot of back and forth but the basic idea is this, the calculator is “directionally” correct 
 +but is not the most accurate way to model all of that stuff. We did evaluate a much faster model but on 
 +an AWS m1.small instance it was taking over 15 minutes to complete with only one user. Simply put, this 
 +RAID reliability calculator will give you a fairly good idea regarding which RAID level is the most 
 +reliable given a number of drives.
 +</code>
 +
 +====== Fixing Disk Signature Collisions ======
 +
 +From: https://blogs.technet.microsoft.com/markrussinovich/2011/11/06/fixing-disk-signature-collisions/
 +
 +<code>
 +Method 1: If you right-click on the disk, the utility offers an “Online” command that will cause 
 +Windows to analyze the disk’s partition table and mount its volumes:
 +
 +Method 2: With the disk signature in hand, open an administrative command prompt window and run 
 +Diskpart, the command-line disk management utility. Enter “select disk 2”, replacing “2” with 
 +the disk ID that the Disk Management utility shows for the disk. Now you’re ready for the final 
 +step, setting the disk signature to its original value with the command “uniqueid disk id=e9eb3aa5”, 
 +substituting the ID with the one you saw in the BCD:
 +</code>
 +
 +====== M.2 SSD ? HOW TO TELL WHICH IS WHICH ======
 +
 +From: https://rog.asus.com/articles/maximus-motherboards/buying-an-m-2-ssd-how-to-tell-which-is-which/
 +
 +From: http://arstechnica.com/gadgets/2015/02/understanding-m-2-the-interface-that-will-speed-up-your-next-ssd/
 +
 +^KEY ^CARD MEASUREMENTS ^INTERFACES ^COMMON USES ^
 +|A |1630, 2230, 3030 |PCIe x2, USB 2.0, I2C, DisplayPort x4 |Wi-Fi/Bluetooth, cellular cards|
 +|B |3042, 2230, 2242, 2260, 2280, 22110 |PCIe x2, SATA, USB 2.0, USB 3.0, audio, PCM, IUM, SSIC, I2C |SATA and PCIe x2 SSDs|
 +|E |1630, 2230, 3030 |PCIe x2, USB 2.0, I2C, SDIO, UART, PCM |Wi-Fi/Bluetooth, cellular cards|
 +|M |2242, 2260, 2280, 22110 |PCIe x4, SATA |PCIe x4 SSDs|
 +
 +
 +From: https://en.wikipedia.org/wiki/M.2
 +
 +<code>
 +Legacy SATA - Used for SATA SSDs, and interfaced through the AHCI driver and legacy SATA 3.0 
 +
 +PCI Express using AHCI - Used for PCI Express SSDs and interfaced through the AHCI driver
 +AHCI has some inherent inefficiencies when applied to SSD devices, which behave much more 
 +like DRAM than like spinning media.
 +
 +PCI Express using NVMe
 +At a high level, primary advantages of NVMe over AHCI relate to NVMe's ability to exploit 
 +parallelism in host hardware and software
 +
 +</code>
 +
 +<code>
 +M.2 SSD Buyers Checklist:
 +Whether your motherboard/notebook supports 
 +   M.2 SATA or M.2 PCI-Express (hint: check the specs page!)
 +The type of keying 
 +   (B/M/B+M) supported by the motherboard/notebook socket
 +If it is PCI Express, whether it supports 
 +   2x or 4x PCI-Express
 +The maximum length of SSD drive supported 
 +   (2232 2242 2260 2280 22110) (hint: it should say on the PCB)
 +</code>
 +
 +
 +====== How to Upgrade Your Laptop’s Hard Drive to an SSD ======
 +
 +From: http://www.laptopmag.com/articles/ssd-upgrade-tutorial
 +
 +<code>
 +Clone to USB
 +Install disk cloning software. For this tutorial, we're using EaseUS Todo Backup Free, which 
 +is free for personal use, has a user-friendly interface, and also optimizes the migration to 
 +an SSD.
 +</code>
 +
 ====== Western Digital WD VelociRaptor ====== ====== Western Digital WD VelociRaptor ======
  
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 If you are looking at this hard drive, you may be wondering what it offers beyond identical capacity 7200 rpm drives that cost less. Specifically, the Western Digital Black and SE drives are candidates. The Black drives are very similar to enterprise class drives right down to the 5 year warranty. The big difference is drives like the WD2000FYYZ have TLER (Time Limited Error Recovery). In layman’s terms, if an error occurs with the hard drive in a RAID array, a drive will most likely not be able to recover and the RAID may need to be rebuilt. Without TLER, another error during RAID rebuilding results in all data being lost. So, TLER is why you may not want a Black edition drive. For the SE model Western Digital drives which also feature TLER, the big difference is that the SE has a much lower MTBF (800,000 hours vs. 1,400,000 hours) and the non-recoverable read errors per bits read is also not as good (<10 in 10^15 vs. <10 in 10^16). Performance-wise, I ran some benchmarks and according to ATTO I’m getting a little over 160 MB/s for both read and write. That’s pretty good for a mechanical drive, although it is less than the advertised 171 MB/s listed on the spec sheet. I’ve read other reviews saying this drive is loud during read and write seeks. Subjectively, I find it equal in acoustics to my Western Digital Black drive (FALS). Yes it’s audible, but if silence is your priority then you should be looking at a different model to begin with.” If you are looking at this hard drive, you may be wondering what it offers beyond identical capacity 7200 rpm drives that cost less. Specifically, the Western Digital Black and SE drives are candidates. The Black drives are very similar to enterprise class drives right down to the 5 year warranty. The big difference is drives like the WD2000FYYZ have TLER (Time Limited Error Recovery). In layman’s terms, if an error occurs with the hard drive in a RAID array, a drive will most likely not be able to recover and the RAID may need to be rebuilt. Without TLER, another error during RAID rebuilding results in all data being lost. So, TLER is why you may not want a Black edition drive. For the SE model Western Digital drives which also feature TLER, the big difference is that the SE has a much lower MTBF (800,000 hours vs. 1,400,000 hours) and the non-recoverable read errors per bits read is also not as good (<10 in 10^15 vs. <10 in 10^16). Performance-wise, I ran some benchmarks and according to ATTO I’m getting a little over 160 MB/s for both read and write. That’s pretty good for a mechanical drive, although it is less than the advertised 171 MB/s listed on the spec sheet. I’ve read other reviews saying this drive is loud during read and write seeks. Subjectively, I find it equal in acoustics to my Western Digital Black drive (FALS). Yes it’s audible, but if silence is your priority then you should be looking at a different model to begin with.”
 — Robert P. 10/9/2013 — Robert P. 10/9/2013
 +
 +====== TLER and OS drives ======
 +
 +From: http://www.pcguide.com/vb/showthread.php?88925-Does-TLER-do-any-good-for-software-RAID-1
 +
 +
 +<code>
 +While I would still prefer to use something like WD's Red drives for software-based RAID, you could use 
 +standard consumer-grade SATA drives and be just fine. Any errors your drives encounter will cause the array 
 +to take a bit longer to respond, but RAID 1 is computationally simple and such delays would not be too bad
 +considering the alternative.
 +
 +If this RAID 1 array is for an OS install, I would recommend using standard SATA drives (you want that 
 +self-healing!). If this RAID 1 array is for storing data, I would recommend TLER (do not forget to turn 
 +it on!). If this RAID 1 array is for a dedicated file server, I would recommend Red drives (you want error 
 +reporting here).
 +</code>
 +
 +====== Support for WD desktop drives in a RAID 0 or RAID 1 configuration ======
 +
 +From: http://wdc.custhelp.com/app/answers/detail/a_id/996
 +
 +
 +<code>
 +WD desktop hard drives (WD Blue, Green, or Black) have been tested and are recommended for consumer 
 +RAID applications when using the drives in a RAID 0 (Stripe) or RAID 1 (Mirror) configuration.
 +However, there are several things to keep in mind when setting up a RAID with these drives:
 +WD only recommends using a Desktop drive in a RAID array with no more than two (2) drives 
 +(Raid 0 or Raid 1 only).
 +</code>
 +
 +**Further reading**
 +
 +From: https://en.wikipedia.org/wiki/Error_recovery_control
 +
 +<code>
 +In a stand-alone configuration TLER should be disabled. As the drive is not redundant, reporting 
 +segments as failed will only increase manual intervention. Without a hardware RAID controller or 
 +a software RAID implementation to drop the disk, normal (no TLER) recovery ability is most stable
 +
 +Western Digital Time Limit Error Recovery Utility - WDTLER.EXE
 +
 +http://www.smartmontools.org/
 +</code>
 +
 ====== Hirens BootCD 9.6 ====== ====== Hirens BootCD 9.6 ======
  
systems/harddrive.1432919304.txt.gz · Last modified: by superwizard