On Mon, 01 May 2017 22:08:13 +0100, Adrian wrote:

> In message , Martin Gregorie
>  writes
>>On Mon, 01 May 2017 18:00:34 +0100, The Natural Philosopher wrote:
>>
>>> On 01/05/17 16:41, Adrian wrote:
>>>> In message , Adrian
>>>>  writes
>>>>
>>>>
>>>>   9 Power_On_Hours 0x0032 060 060 000 Old_age Always - 35414
>>>
>>> That alone tells me its time for a new disc..
>>
>>Yep. I just had two fail around that mark (37000 hours for 2.5" and
>>49700 hours for 3.5" - coincidentally both Hitachi drives).
>>
>>It may well be worth spending the extra few quid for an enterprise grade
>>drive if its going to be on continuously, e.g get a WD Red rather than a
>>WD Blue or the equivalent for your preferred brand.
>>
>>
>>
> The current disc is a 2TB, largely because it was what was available at
> the time.  Most of the time it is less 2% used, so it is rather bigger
> than it needs to be, but is being used on a continuous basis.
>
> So what is a suitable replacement HDD or SSD ?
>
Pass. Wot I wrote is wot I know.

I recently replaced the 3700 hour 120GB Hitachi HDD in my Lenovo R61i
laptop with a 128GB Sandisk SSD but as smartd says it has only had 2
hours use so far I obviously can't say anything useful about its
durability.

The R61i was replaced by a Lenovo T440 with a Hitachi 500GB HDD with 2000
hours on it (really cute machine with 8GB RAM and a 1600x900 screen). All
is good so far.

The dead 3.5" 250GB Hitachi Deskstar (49700 hours) was replaced with a
500BG WD Blue about 250 hours ago, so again I can't yet say anything
useful about it.

Speculation follows.

If I'd been *thinking* I should have replaced the dead 3.5" Hitachi with
a 500GB  or 1 TB WD Red because the MTBF and warranty length for the Red
series is much longer than for the Blue and the annoyance factor of
replacing a disk increases at least linearly with disk size.

Going beyond that, at some point  the annoyance factor gets big enough to
justify replacing a single HDD with a RAID farm so you can hot-swap
failing drives. The offline backup is still, IMO, mandatory if you go
that way because online drives are still subject to destruction from
mains strikes and house fires.

Hearsay and internet sources say that a consumer-grade SSD can fail
completely with little or no warning while an enterprise SSD tends to
fall back to read-only at EOL so you can at least pull the data off it
when it fails.  Whether this (and cost) influences your choices depends a
lot of how much you value the data and how frequently you make offline
backups.

HTH


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martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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