Macbook Pro sleep mode secretly "Hibernates"

[stevey500]

My macbook pro Core2duo 15" has a secret. . . Well, morely of a feature I didnt know existed.

Back on the Powerbook G4 12" I had... If the powerbook is closed and gone to sleep mode, if the battery is removed, the ram is erased and when you put the battery back in and boot up, it must reboot to bring you back into os/x... therefore everything you were doing is gone.

On the mabook pro, I THINK that when the machine is put into sleep mode, it writes the ram to the cache on the hard drive secretly before entering true sleep mode. I think it does this while the sleep light is steady, when its done writing, it does the "breathing pulse". When sleeping... remove the battery. Sleep light shuts off, macbook appears to be completely shut down. Put the battery back in, sleep light is still off. Open the lid, hit the power button, lcd turns on and everything that was open is still showing, bit is greyed out, A bezel shows on the screen and very quickly, a loading bar goes across and BAM, you're back to where you were.

DOn't know if anyone else has found this out or was pretty obvious...
Nice to know it does this for those who are wondering if getting 2 batteries would be a good idea.

 

[QuarterSwede]

OS X 10.4 does have the ability to hibernate as I've enabled it on my 12" PowerBook (it hibernates right before the battery power is completely depleted as a last resort so you don't lose data). My guess is that it's just been enabled for MacBook (Pro's) by default now.

 

[Fearless Leader]

it also eats the equivalent of the size of your ram on your hard drive. You can turn it off if you want through some terminal commands.

 

[hopejr]

It's called SafeSleep.
http://docs.info.apple.com/article.html?artnum=302477

 

[stevey500]

Oh wow .... That's pretty cool though.
Os/x rocks. . .
I'm okay with the extra gig gone.

 

[Cameront9]

One note: You should be able to put the computer to sleep, remove the battery, and replace it with a different battery with no issues whatsoever. Both the older G4s and the Intels. I believe you have something like 2 minutes to do this before the power dies.

 

[TBi]

OS X 10.4 does have the ability to hibernate as I've enabled it on my 12" PowerBook (it hibernates right before the battery power is completely depleted as a last resort so you don't lose data). My guess is that it's just been enabled for MacBook (Pro's) by default now.

I'm pretty sure it creates the hibernation file when you sleep the notebook. That's why it takes longer for the new laptops to "sleep" compared to older ones.

 

[hopejr]

I'm pretty sure it creates the hibernation file when you sleep the notebook. That's why it takes longer for the new laptops to "sleep" compared to older ones.

In a nutshell, yes, that's correct.

 

[e12a]

I've noticed this as well while tinkering with the battery near the end of class.

I freaked out cause I saw that the power LED was off after I removed the battery.