On 2016-06-01 11:07, David Kastrup wrote:
David Kastrup <d...@gnu.org> writes:
Hi,
my current development SSD, graciously donated by James, currently has
the following readings:
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED
WHEN_FAILED RAW_VALUE
5 Reallocated_Sector_Ct 0x0033 099 099 --- Pre-fail Always
- 13
9 Power_On_Hours 0x0032 094 094 --- Old_age Always
- 25748
Ok, I might have been panicking because of all the lines with "Pre-fail"
and "Old_age" but they only indicate the _category_ of the respective
settings. Sorry for that.
I'm still trying to figure out the readings as such though. The
"documentation" including online is not much help.
Hi David,
recently I was afraid about my SSD for the same reason, so I asked our
institute's IT service staff who cares for some dozens (hundreds?) of
laptops and desktops with SSDs.
They say that even power users of hibernation with high rate of data
turnover didn't manage to damage their SSDs lately; the horror stories
for the first generations of SSDs seem not to apply anymore. You still
have to take a bit of care (try to have some empty space, and run fstrim
once in a while), but other than that you should be fine.
As you experienced, the SMART information is rather unhelpful unless you
have additional context by the manufacturer; more often than not, the
only semi-reliable source are the manufacturer's own toolkits (which,
unfortunately, are hardly available on Linux).
However, there have been a few reports in the past about shaky power
supply for the disks, probably when laptop batteries grow older. Some
SSDs cope with that without problems, others are very sensitive to
voltage differences (?) and suddenly become unstable. Signs of this
behavior are ATA warning messages concerning the "ATA interface" in
dmesg output, such as those:
https://lime-technology.com/wiki/index.php/The_Analysis_of_Drive_Issues
Quote: "There have been too many cases of drives thrown out or returned
by an RMA process, when the problem was just a bad cable!" - which
exactly matches the experience of our IT.
If drives barf out for those reason, they have always been able to copy
the contents with an external adapter - annoying, but not dangerous.
That being said: which form factor/connector do you need? I can ask if I
can grab something. Many parts from few-year old machines are sorted out
regularly here. Not sure about hard disks, though - there might be
regulations for data protection that prevent them from giving out old
drives.
Cheers,
Alexander
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