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2TB WD Purple Surveillance Hard Disk Drive $65AC@Newegg

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Double secret probation Joined Sep 2007 L10: Grand Master
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#2
What's a surveillance drive?
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#3
A drive used in surveillance systems.
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#4
And why do i need a special drive for that?
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#5
Its a hard drive designed specifically for use in a video surveillance system. It facilitates proper read/write of the recorded multiple streams of video that is being stored and is designed for 24hr/7days a week run time unlike normal hard drives.
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#6
Quote from crusian
:
And why do i need a special drive for that?
It's optimized for the type of data used in surveillance systems. Aka 24/7 writing to the drive and only occasional reading. Ideally will last longer for this purpose than a normal generic drive.

NAS drives (storage systems) are designed for long periods of idling (so oppisite of purple surveillance) with sudden high bursts.
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#7
Everyone seems to be buying the marketing koolaid on these "specialized" drives.
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#8
Put 3.5 inch in title please.
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#9
Are these specialized drives for various purposes shown to actually have longer longevity and better performance than generic HDs?
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#10
Quote from crusian
:
And why do i need a special drive for that?
Because we said so.
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#11
Quote from igeak691
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Are these specialized drives for various purposes shown to actually have longer longevity and better performance than generic HDs?
These are not drives you'd want to use anywhere other than a surveillance system. The cache is segmented for multiple write streams and they'll drop data in a heartbeat if a write doesn't complete, as all that's going to do is glitch your recording for a moment.

So they're unreliable outside of surveillance or a NAS, and they cache segmentation means that unless you're pounding the drive with over 10 write streams it'll be slow. You may also have problems with sleep on the drive, as they're not meant to ever do that.
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#12
Quote from tenkay
:
These are not drives you'd want to use anywhere other than a surveillance system. The cache is segmented for multiple write streams and they'll drop data in a heartbeat if a write doesn't complete, as all that's going to do is glitch your recording for a moment.

So they're unreliable outside of surveillance or a NAS, and they cache segmentation means that unless you're pounding the drive with over 10 write streams it'll be slow. You may also have problems with sleep on the drive, as they're not meant to ever do that.
Best to go with black and gold drives as they have the best long term value and use the highest QC/materials. Either way wd still makes the highest quality product but needs to be better priced throughout the year instead of 1 or 2 times a year
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#13
Installing a camera system at the moment and it has an included drive (likely not the best), and I wouldn't mind have redundancy, but I've never paid attention to pricing of these.
Is there a general $/GB that these drives follow for normal/sale pricing? I'm mostly looking at WD because I've never had a bad experience with them.
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#14
Can you use these drives in your computer? or are they specifically external
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#15
Quote from nzalog
:
Everyone seems to be buying the marketing koolaid on these "specialized" drives.
I'll take the grape koolaid, please!

There is some merit to the specific versions of these drives - most notably, in the error handling functionality of the drive firmware. Regular desktop drives will attempt to read from bad sectors for a relatively long period of time before giving up. When configured in a RAID array, if this timeout is longer than the RAID allows for, the drive will get marked as bad and dropped from the array. This equals a greater probability that you'll have a RAID failure and will potentially be replacing drives unnecessarily.

IF you're not doing RAID, then there's really not a lot of merit to the additional cost/features IMO. They also supposedly handle vibration better do head parking differently which supposedly leads to a longer lifespan.

All that said, I've had a pair of Hitachi Deskstars in my NAS server now for over 6 years, regular desktop drives, and have had zero issues.

Regardless, I still went out and bought the NAS version of 4TB recently simply for peace of mind. They aren't really that much more. I guess in a way it's kind of like buying an extended warranty on something. Which I don't normally do. So, I don't know what to make of that. *sips koolaid*
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