Keith C. Perry on 12 Jan 2016 13:47:34 -0800

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Re: [PLUG] UEFI Boot order

"Depending on the OEM" is an understatement.  This is still a major problem area for drive makers.

Not all SMART capable drives are created equal so really the indirect proof is best.  Once you see filesystem problems the bottom line is that something is very wrong and you are now on borrowed time.

Granted this could be a result of bad RAM (and thus fs corruption) but even though the likelihood of this type of double fault is rare, it is not unheard of.  You usually see it happen when there are power issues.  I had a server die slowly last year as a result of a what I think was a power spike, which doesn't have to be dramatic event- complete with mobo fires and smoke.  More often than not it's something you would not eye witness directly.  Laptops generally do not have a good ground network so I could easily see multiple issues occurring.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
Keith C. Perry, MS E.E.
Owner, DAO Technologies LLC
(O) +1.215.525.4165 x2033
(M) +1.215.432.5167

From: "Rich Mingin (PLUG)" <>
To: "Philadelphia Linux User's Group Discussion List" <>
Sent: Tuesday, January 12, 2016 4:26:32 PM
Subject: Re: [PLUG] UEFI Boot order

Modern drives actually ship from the factory with a reserve area of blocks specifically for working around/over bad blocks. When the drive hits a bad sector, it flags it internally and uses one from the reserve, it's completely and totally handled at the hardware level, the OS is unaware. By the time the OS is seeing bad blocks/sectors, you have a LOT of them, and the drive should not be used. Depending on the OEM, the SMART info may report the internally-corrected bad block count and the uncorrected (visible to the OS) bad block count. Some do, some don't.

On Tue, Jan 12, 2016 at 4:20 PM, brent timothy saner <> wrote:
Hash: SHA512

On 01/12/2016 04:14 PM, Mike James wrote:
> the drive could also have some errors on it. I've used SpinRite many
> times to repair funky-acting drives.

spinrite actually doesn't fix anything since bad sectors are hardware
issues (you can do the same thing with badblocks). what it does is map
those bad sectors so the filesystem ignores them. however, once you
start getting bad sectors, the problem tends to worsen and more bad
sectors appear and the drive gets worse.

if you have any bad sectors as reported from badblocks, your best bet
really is to just get a new drive. (if it's a new drive, RMA that thing
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