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Old January 11, 2012, 06:00 PM
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Default Random ssd question

Just had a question about SSDs. Are they prone to data loss because of power outages? I heard someone make this claim,but I wasnt so sure so I couldn't refute it.

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Old January 11, 2012, 06:18 PM
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i have never lost data on one yet in over 5 years and i have an ssd in every machine
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Old January 11, 2012, 06:32 PM
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Sounds like your friend is misunderstanding a problem that is concern in servers. Basically IF a SSD accepts an IO and is in the process of writing it and the power goes out the data could potentially be corrupt. This is a concern with RAID arrays, and hdds as well in servers as there is massive IO loads. Servers get arround it by using batterys for the raid controller and super caps in the drives and battery backups for the computers. In the home envrio it can happen (think NCQ casuing a random prob) but it is very rare and can happen to hdds and not just ssd's. Its why everyone says to do a GRACEFUL shutdown and not just unplug as it can cause wonky corruptions. THAT is the root cuase of the "gremlin". Its not really a big issue with a home enviro but if you use a hdd OR a ssd and dont want it to happen...buy a cheap battery backUPS. Will save your bacon as it will condition the power (make it a pure 120 with no dirty harmonics) which will make your PSU last longer. As an added bonus you wont have to "worry" about data corruption from a 1 in a 10,000 chance freak power outage. ;)

YMMV
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Old January 11, 2012, 08:09 PM
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While (partiality) true as AkG explained above, most modern SSD's nowadays have a supercap built in to flush the most recent writes to disk anyways. I know the first and second gen Intel SSD's didn't have a supercap, but the gen3's and beyond do for example.

Only a major concern typically in high IOPS situations on high-end raid arrays with write-back caches(hence why many of them provide a "BBU" solution, aka battery or supercap). Typically you'll only find those in servers, or SAN software.
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Old January 11, 2012, 09:14 PM
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Actually MOST "consumer" SSDs dont come with the supercap. They have ROOM on the pcb for it...but dont have it included. IMHO its not needed as its a non issue for 99.999 of home user scenarios. :)
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Old January 15, 2012, 10:33 AM
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Quote:
Originally Posted by gingerbee View Post
i have never lost data on one yet in over 5 years and i have an ssd in every machine
SSDs have been out for 5 years...wow
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Old January 15, 2012, 10:37 AM
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They have come along way, very stable and reliable. That being said, everyone should have a back-up.
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Old January 15, 2012, 11:24 AM
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Quote:
Originally Posted by TedShackley View Post
SSDs have been out for 5 years...wow
well in fact they have been around much longer but i didn't really start to buy them in mass until about 4 to 5 years ago

p.s ssd tech was developed by nasa i believe for space exploration
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Old January 22, 2012, 11:17 PM
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Quote:
Originally Posted by TedShackley View Post
SSDs have been out for 5 years...wow
Over thirty years actually.

SSD (Solid State Disks) Market History - article on STORAGEsearch.com
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