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Forum Discussion
HDD price
Hi all, slightly OT conversation here. I purchased 2xWD RED 4TB HDDs last summer for my Pro 6. The idea was to add another 4TB HDD once the price had fallen. I have been monitoring the prices, ...
OS 4 has two expansion limits - a volume cannot expand over 16 TiB, and it cannot grow more than 8 TiB larger than its starting point. You cannot install mixed disk sizes with a total volume > 16 TiB, because the xraid2 won't vertically expand when it creates the initial volume.
If you are needing more space now, I'd get another 4 TB drive - that will double your volume size, and is cheaper (per gigabyte) then the larger disks right now.
Later on (when you are faced with a factory reset anyway) you can perhaps migrate to OS6 - which doesn't have those expansion limits.
Thanks Stephen,
Sounds good.
I tried OS6 in the past and I felt it was a little young. As you say by the time I need extra space - and I'm faced with a factory reset anyway - I may want to move to OS6 and install whatever the market offers in the future.
Thanks for your advice as usual.
Another article on HDD pricing... http://www.forbes.com/sites/tomcoughlin/2014/12/22/hdd-areal-density-and-tb-trends/
The first figure shows that current hard drives are essentially at the 1 terabit/sq inch ceiling of PMR. It predicts introduction of HAMR in 2017.
The article also discusses the possible impact on pricing of both industry consolidation and the loss of factories in Thailand in late 2011. The pricing trend shift to a new track in 2012 as you can see by the graph in figure 2.
Dear Forum Members
I know that this is an old thread and I have nothing technical to add but as anyone noticed that the price per TB for an HD goes up the bigger the HD capacity.
For example, the price per TB for a 4TB WD Red is about £31.50 but for 3TB WD Red is £21.23, more than £10 less.
My calculation is rough and ready and cannot be taken as a definate state of current affairs but is anyone as surprised as I am that 4TB HD prices have not started to fall yet. There are probably various economic and (possibly) environmental issues that have kept prices high but I feel, rather than know, that HD prices should have started to fall by now.
UK Bob
Of course on-line prices are always shifting. The cheapest per TB prices in the US usually are the 4 TB models.
WD30EFRX: ~$120 or $40/TB
WD40EFRX: ~$150 or $37.50/TB
I'd love to see 6 TB drives prices drop, though I am thinking prices won't fall off much until HAMR drives reach the market. That's just a guess though.
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