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SSD Problems

BradHatter said:
Here's a newer post that I came across about data corruption on SSDs:

https://blog.algolia.com/when-solid-state-drives-are-not-that-solid/

Now that one makes me say "ouch!!"
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This shouldn't affect Macs.

I say this because as a Linux sysadmin, for those particular drives, admins have the option of two types of TRIM: Queued TRIM, and Sequential TRIM. in the Blog entry, there is a comment leading to a user who asked Samsung about this, in which they suggested to NOT USE Queued TRIM, and use Sequential TRIM, which is what Windows and OS X uses.

So as long as you are using Sequential TRIM or no TRIM at all, your SSD is okay. Nevertheless, this is a reason why you need to have backups of your data.

BL.
 
I really wonder about the merits of TRIM. If you do really disk intensive stuff, I suppose it might be worthwhile, but I don't, and I can't really tell the difference between a TRIM'd and non-TRIM'd disk. It's just another level of complexity that may not really be needed by most people.

An opinion, of course.
 
Completed an update to my late 2008 15 inch Mac Book Pro. I hadn't made any changes since I purchased it new. I increased the memory from 4 to 8Mb and installed a Crucial M500 960 SSD. Well my initial impression is WOW. These changes have made a monumental performance increase thats very impressive. This thing boots-up in about 1/4 of the time and loads photos, apps and internet pages in nothing flat. Looks like I won't be looking for a replacement for the next couple years.
 
Samsung seems to be having some problems. First there's the performance problems seen in the 8XX series and now there's apparently some type of TRIM problem, at least in one mode.
 
ZVH said:
Samsung seems to be having some problems. First there's the performance problems seen in the 8XX series and now there's apparently some type of TRIM problem, at least in one mode.
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Yeah, but that sort of thing is always going to happen with something. Samsung just seems to be having some bad luck right now.
 
I said it before and I'll say it again - SSDs still aren't quite wrung out yet.
 
I saw a PCI based SSD in a MacBook Pro boot from that nightmare known as Yosemite and it did it in about 15 seconds. Anyone know if the PCI interface in them is a unique PCI interface or is it an implementation of SATAe?
 
I believe it's a version of SATAe, but it might be Apple proprietary. Not really sure.
 
ZVH said:
Samsung seems to be having some problems. First there's the performance problems seen in the 8XX series and now there's apparently some type of TRIM problem, at least in one mode.
Click to expand...
Only the 840 EVO has a problem with old data (TLC memory). All other 830, 840 Pro, 850 EVO and 850 Pro models do not have this problem, because they use different memory.

And the TRIM problem is OS-specific (Linux).
 
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556fmjoe said:
For anyone who hasn't checked recently, the updates to this have been interesting. Turns out it was a problem with the Linux kernel, not with queued Trim or the SSDs themselves. Samsung has released a kernel patch to fix it.
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The author of that article should consider taking the article down or changing its title or something….maybe something like "When the rock solid Linux isn't so rock solid."
 
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BradHatter said:
The author of that article should consider taking the article down or changing its title or something….maybe something like "When the rock solid Linux isn't so rock solid."
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Like all operating systems, one component isn't the sum of the entire operating system. Would a title like you're suggesting be correct if someone wasn't using an SSD? They actually wouldn't be encountering the problem at all..

I do agree however that the article and thread are misleading.

BL.
 
At the time the article was written it was thought to be correct. He should change the title of the article because it implies a non-existent SSD problem.
 
It depends on what you mean by "sudden death." If the sudden death occurs after a sudden power loss, no. If it's because the cells are becoming write depleted you might experience slow downs before the SSD either stops responding or just becomes read-only. Read-only, however, isn't really sudden death…more like partially usable.
 
Suppose for some reason that a hybrid hard drive had the SSD portion fail on it for some reason. Does anyone know if this would cause the drive to stop working all together, or would it just start acting like a regular hard drive?
 
MacRobert10 said:
Suppose for some reason that a hybrid hard drive had the SSD portion fail on it for some reason. Does anyone know if this would cause the drive to stop working all together, or would it just start acting like a regular hard drive?
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According to this link:

https://en.wikipedia.org/wiki/Talk:Hybrid_drive

the answer is yes, it would start acting just like an old hard drive and the SSD would just be removed from the equation. I assume that means the SSD died from too many write cycles. If the controller itself went then nothing would work. To be honest most published answers seem like guesses to me because some of this stuff has been around for such a short period of time there's no easy way to tell yet what the typical failure symptoms are.
 
MacRobert10 said:
Suppose for some reason that a hybrid hard drive had the SSD portion fail on it for some reason. Does anyone know if this would cause the drive to stop working all together, or would it just start acting like a regular hard drive?
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It probably depends on exactly what failed and how the drive is made, but it would make little sense for manufacturers to render a drive useless just because it's cache failed, and on a hybrid the SSD is the cache.
 
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