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I am thinking of buying a SSD for my laptop, mainly for the purpose of extended operating time when running on battery.
At the moment I use a Hitachi HTS545032B9A300 (320GB) (Datasheet) as main drive and a Seagate Momentus 5400.3 120GB as secondary drive. I dualboot Windows and Linux but I don't need the windows partition any longer, a 120GB SDD would be more than sufficient space-wise.
Speed is not an issue for me, I make heavy use of tmpfs (ramdrive) within Linux and transfers of bigger files are mainly through some network filesystem anyways, thus a cheaper SSD should do. For the purpose of comparison I chose the OCZ Vertex Plus 120GB.
Power consumption always is a big promotional thing the industry uses to make me want to buy their SSDs, some sheet on the OCZ page provides an astonishing comparison of desktop HDDS and SSDs. The numbers I got comparing my laptop HDD and their SSD were not really astonishing any longer.
Hitachi 320GB HDD:
Startup (W, peak, max.) 4.5
Seek (W, avg.) 1.7
Read / Write (W, avg.) 1.4
Performance idle (W, avg.) 1.3
Active idle (W, avg.) 0.8
Low power idle (W, avg.) 0.5
Standby (W, avg.) 0.2
Sleep 0.1
OCZ 120GB SSD:
1.5W active
0.3W standby
I see that there are differences, but actually they don't seem that high as I though they were. And compared to the power consuption of the rest of my system I wonder if it makes a difference at all.
Have I just taken the wrong look at the whole thing or may I be better off to buy another battery for my laptop?
Looking at those specs, I would probably think it would see more battery savings in idle time. I've never bought an SSD for battery savings though, only performance. I'd love to hear what other experts may say – Canadian Luke – 2012-06-07T16:12:58.803
I am not really sure that the definition of standby is the same for HDD and SSD. I guess standby for SSD is comparable to idle for HDD, but thats just a thought. – Baarn – 2012-06-07T16:25:52.823
Standby for the SSD is essentially equivalent to everything from Performance Idle to Standby for the hard drive. So in a situation where the hard drive would be in Standby the SSD would also be in Standby, and in a situation where the hard drive would be in Performance Idle the SSD is in standby. – Mr Alpha – 2012-06-08T10:28:51.000
If all you care is power consumption, take at look at SanDisk SSD's, AFAIK they have the lowest.
– jgillich – 2013-08-13T09:48:11.453