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Increase battery run time on laptops with SSDs
Authored by: byrno on Apr 15, '10 11:38:01PM

I had the same idea, and bought an Intel SSD. I have a late-2008 MBP, 4GB RAM, formerly with Apple's 320GB HD, probably 5400 rpm. I timed cold starts and unhibernates (wake up from hibernation) with the HD and with the Intel X25-M 160GB SSD I installed:

Apple's 320GB HD:
Cold start: 49 seconds
Unhibernate: 68 seconds

Intel X25-M 160 GB SSD:
Cold start: 67 seconds
Unhibernate: 83 seconds.

These were my results immediately after swapping disks using Carbon Copy Cloner, so the systems were identical. This doesn't seem to make sense! Launching applications (Word, Safari, iTunes) is faster now - that could be from the fast random read speed of the X25. But my numbers don't match the "5 seconds or so" for wake-up that soulbarn reported (and other reviewers have made similar comments). Repairing permissions made unhibernate a bit faster, but wake-ups aren't much faster anymore, and permissions aren't broken). I installed the early-2010 Intel firmware upgrade; no difference.

Hibernate times now are about 26 secs; unhibernates are generally 45-65 secs since I fixed permissions. I don't remember what choices I had or made when I first mounted the SSD as an external drive to clone my hard drive to; maybe I missed an important option. Neither Apple's Disk Tool nor TechTool Deluxe reports any problem. Usually during unhibernation the indicator with 20 or so little vertical ovals just races along for 5, or 7, or 16 ovals, and then hesitates for a long time before resuming.

Why isn't my SSD faster?



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