SSD's effect on battery life

Discussion in 'MacBook Air' started by MikeyTree, Jan 31, 2008.

  1. macrumors 6502

    Joined:
    Jan 5, 2007
    #1
    Would having a SSD instead of a hard drive have an impact on the battery life of the MBA?
     
  2. macrumors regular

    Joined:
    Jan 29, 2008
    #2
    Everything that I've heard is that they would make the battery last longer since there is no moving parts.
     
  3. macrumors 68000

    tersono

    Joined:
    Jan 18, 2005
    Location:
    UK
    #3
    Yes, in theory the SSD should use less power than an HD. Whether it will be enough to be noticeable is questionable, though
     
  4. macrumors 68040

    Cybergypsy

    Joined:
    May 16, 2006
    Location:
    Central Florida!
  5. macrumors 6502a

    Joined:
    Aug 8, 2006
    #5
    compared to a 4200rpm drive
    i say insignificant % hardly noticeable
     
  6. macrumors G5

    nagromme

    Joined:
    May 2, 2002
    #6
    It would have some effect: spinning an HD up and down uses power, which is why an HD iPod gets lower battery life if you skip a lot. Not so with an SSD iPod.

    But that little power savings isn't what I want, so much as the speed--and not having those little delays (seen even on desktop computers) when the HD spins up after sitting idle.

    I also want the durability/longevity.
     
  7. macrumors newbie

    Joined:
    Jan 22, 2008
    #7
    Much less power usage with the SSD

    According to this review from 8/07:
    http://www.tomshardware.com/2007/08/13/flash_based_hard_drives_cometh/

    For the 2.5" SSD vs HD, according to the manufacturer's specs:
    SSD: 0W/1W/0.4W
    HD: 5.5W/2.4W/0.6W
    (Spin Up/Read+Write/Idle)

    So for SSD vs HD, roughly 2.4x less usage while reading/writing, and 1.5x less while idle, with no power usage to "Spin Up" and no delay for a powered down drive (power saving mode) to spin up for use.

    Interestingly enough, they also looked at SATA SSD's versus a PATA SSD (like the one Apple uses in the MBA) power usage when idle. The SATA consumes 0.4 W when idle, which is >10 times higher than the power consumption of the PATA, which consumes 0.05 W when idle. This could explain why Apple went with PATA despite SATA's improved performance. The hit on the battery life may not have been worth the added performance in their estimation.

    What this translates to in real life use is something else completely. We'll have to see how the 64GB SSD holds up in real life use.

    DaveC

    ---------------------

    A place for MacBook Air owners: http://groups.google.com/group/mac-book-air
     

Share This Page