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Xeb's Misadventures as a Data Recovery Engineer - Updated 4/11/2017 - Page 12

post #111 of 220
Btw, I'm not trying to eliminate your job. Sadly, no matter how many people we convince to do proper backups, there will be plenty who will not and will need your services. 'Tis human nature.
     
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post #112 of 220
Thread Starter 
Quote:
Originally Posted by Lord Xeb View Post

Hard drives will never become obsolete unless flash can compete in capacity. Overall, flash is more "reliable" in terms of shock resistance and mechanical damage but they still do fail and they have a lot more than can go wrong. Usually when they fail they give no warning at all. Just lock up, dead. Done. Occasially you will get a sign there is an issue but rarely. Though, with how complex a SSD is, I am not sure about how good they would be in the long term of things. Addiitonally, since SSDs are not very common (due to price) I do not see a lot of them.

Then again, even hard drives can fail without warning. But, at least you can still read from a badly degraded surface. Good luck reading from a dead NAND.

Quote:
Originally Posted by Lady Fitzgerald View Post

Quote:
Originally Posted by Lord Xeb View Post

Hard drives will never become obsolete unless flash can compete in capacity. Overall, flash is more "reliable" in terms of shock resistance and mechanical damage but they still do fail and they have a lot more than can go wrong. Usually when they fail they give no warning at all. Just lock up, dead. Done. Occasially you will get a sign there is an issue but rarely. Though, with how complex a SSD is, I am not sure about how good they would be in the long term of things. Addiitonally, since SSDs are not very common (due to price) I do not see a lot of them.

Then again,even hard drives can fail without warning. But, at least you can still read from a badly degraded surface. Good luck reading from a dead NAND.

Then again, having and maintaining a good backup scheme will eliminate all those problems (not to mention be whole lot more reliable and dramatically less expensive than professional data recovery).

Quote:
Originally Posted by Lord Xeb View Post

Then again, you would be correct.

Quote:
Originally Posted by Lady Fitzgerald View Post

Btw, I'm not trying to eliminate your job. Sadly, no matter how many people we convince to do proper backups, there will be plenty who will not and will need your services. 'Tis human nature.

>.> I knwo you are not. I just thought I would continue to trend. rolleyes.gif
 
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post #113 of 220
Quote:
Originally Posted by CynicalUnicorn View Post

Also keep in mind that the contents of the NAND are generally encrypted. When you secure erase an SSD, the decryption key is deleted forever and the entire contents are scheduled for garbage collection.

Since when? Even with Self-Encrypting Drives, surely you have to switch that feature on?
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post #114 of 220

Great read Lord Xeb! I too had a bad experience with failing drives. Now I have a daily backup of my computer to my NAS (RAID5) together with my girlfriends photography database. Which I symlinked to my Dropbox Business folder, so I basically mirror my entire NAS to Dropbox. Hoping that this is secure enough.

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post #115 of 220
Also, my understanding is that SandForce drives use compression as well, so there's even less of a chance to successfully raw-read the contents of the NANDs.

I once had a 1 TB drive fail dead, no warning. eek.gif That was bad, but not as bad as it could've been since it was mostly scratch storage and the critical stuff was backed up across other drives.
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post #116 of 220
Yeah, SandForce is definitely interesting. Its write amplification factor (how many bits are written to the drive vs how many bits are in the file) is less than one. It's about 0.7. That's why incompressible benches such as AS SSD cause performance to tank, but it's great at 0/1-fill.
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post #117 of 220
Thread Starter 
When i am not brain dead I will give an update on that hard drive eval from hell and a new RAID eval from hell. e-e

RAID 10 that failed during a rebuild anyone?
 
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post #118 of 220
That's one reason I don't use RAID.
     
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post #119 of 220
@Xeb

Let me guess...a four drive RAID 10 based on drives larger than 1TB, and nobody keeping an eye on drive health.

@Lady Fitzgerald

RAID isn't so bad, but too many people deploy it without being aware of the risks. I've been deploying and using RAIDs for years, and I've never lost data due to RAID failure - other reasons (such as rank stupidity), but never RAID failure.
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post #120 of 220
Quote:
Originally Posted by parityboy View Post

...@Lady Fitzgerald

RAID isn't so bad, but too many people deploy it without being aware of the risks. I've been deploying and using RAIDs for years, and I've never lost data due to RAID failure - other reasons (such as rank stupidity), but never RAID failure.

As I said, it was one reason. Others include the risks you hinted at, the difficulty of backing up such a large volume (single backup drives are far more portable), and the fact I just don't need one. This is not to say RAID is a bad thing. RAIDs do have their purposes.
     
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i7-5930K Haswell-e Asus X99-E WS/USB 3.1 Visiontek Radeon 7870 2GB with 6 miniDisplayports G-Skill Ripjaws 64GB (8x8GB) DDR4 2133 
Hard DriveHard DriveCoolingOS
Samsung 850 EVO 4TB SSDs Samsung 950 Pro 512GB m.2 SSD boot drive Noctua NH-D15S Cpu cooler Win 7 Ultimate 
PowerCaseMouseMouse Pad
Corsair AX760 Scratch built. Currently under construction at ... Logitech M525 El Cheapo Allsop hard plastic 
CPUMotherboardGraphicsGraphics
i7-3930k ASUS P9X79 WS MSI R7850 Twin Frozr 2GD5/OC Radeon HD 7850 2GB... Monoprice 1x2 powered HDMI Splitter 
RAMHard DriveHard DriveHard Drive
Kingston HyperX 32GB (8 x 4GB) 240-Pin DDR3 SDR... Western Digital WD Black WD2002FAEX 2TB 7200 RP... Western Digital WD Black WD2001FASS-0 2TB 128 GB Samsung 840 Pro SSD 
Hard DriveOptical DriveCoolingOS
Western Digital Black WD4003FZEX 4TB LG 12X BD-ROM 16X DVD-ROM 48X CD-ROM SATA Inter... COOLER MASTER GeminII S524 120mm Long Life Slee... Windows 7 Ultimate 
MonitorMonitorKeyboardPower
3 x Asus VG248QE Vizio VO320E 32" TV Logitech G510s Corsair HX750W 
CaseMouseAudioAudio
Antec Two Hundred v2 Logitech M525 with Unifying Receiving Corsair SP2500 2.1 Speakers ASUS Xonar Essence STX Virtual 7.1 Channels 24-... 
OtherOtherOther
LSI 9211-8i HBA card HooToo® HT-CR001 3.5" PCI-E to USB 3.0 Multi-in... Antec EasySATA Internal HDD Dock 
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Overclock.net › Forums › Components › Hard Drives & Storage › Xeb's Misadventures as a Data Recovery Engineer - Updated 4/11/2017