Felix Miata wrote:
Per Jessen composed on 2015-03-16 20:35 (UTC+0100):
Felix Miata wrote:
If the actual date of manufacture (often missing from labels of refurbs) is post-2010, it is almost certainly 4k, regardless of size. The only 2TB devices I have were manufactured before 2011. IOW, Anton was on track, everything made in the past 4+ years is 4k.
Empirical evidence says otherwise. I have for instance 24 SATA drives currently active, all 2Tb. They're running 24x7, I'm judging their approx. manufacture date by power_on_hours. The oldest is from Jan2012, the youngest from March 2014.
Can't read the labels on any of them?
Nope, they're all mounted in trays, I'd have to pull them to read the labels.
They're all 512bytes block size. And
Determined how?
Just with fdisk.
What do the manufacturer's specifications report?
Okay, you've tricked me into it :-) WDC RE4 - 512bytes. HGST Ultrastar 7K3000 - 512bytes. HGST Ultrastar A7K2000 - 512bytes My feeling is that 4K blocksize are more often seen on disk-sizes 3Tb and up. I have some WDC 3Tb and some Seagate 4Tb drives for my mythtv setup, I'm certain they're all 4K. Here's one in-store even being advertised as 512bytes sector: https://www.pcp.ch/Hitachi-Ultrastar-7K4000-2TB-3.5-Sector-size-512e-1a17471...
As I replied to Chris earlier today, not every utility ostensibly able to report a device's block size will report it correctly. Going through a RAID controller would raise my level of suspicion.
They are connected to a RAID controller, although configured as JBOD.
yes, they were all deployed within days of purchase. Manufacture date could vary by a couple of months I suppose.
More than a couple. I don't have 24 of any one model, but I do have models with manufacture dates more than 6 months apart.
I bought some WDC RE4's only just recently, but they're spares, I don't know their blocksizes.
Their labels you surely could read to get the dates. :-)
Hehe, true :-) Well, currently we have 10 spares, all WDC RE4 2Tb, manufactured in April or August 2014. AFAICT, bought in batches in March, June and September 2014. (Sep2014 = "recently" ... ). -- Per Jessen, Zürich (6.2°C) http://www.dns24.ch/ - free dynamic DNS, made in Switzerland. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org