iLiad Unmounting external memory to save batteries??

rudysplif · 12-06-2007, 04:30 PM

Will unmounting the CF or SD actually stop power draw and increase battery life?? Or do you have to physically remove the cards??

Are there some other process you need to stop as well?

thanks,

kurifu · 12-09-2007, 12:13 AM

I think it is very unlikely that unmounting the devices is going to make,much of a difference in the amount of power consumption, I don't believe this really causes a change in the hardware state, though I am not too sure on the behaviour of the linux kernel to state for certain.

Additionally even if you are not using the card and leave it in place, the card itself is not going to use much power, probably consumes only tiny amounts of power (so little you likely wouldn't notice). Flash memory isn't like RAM, what causes flash memory to use noteable amounts of power is when the flash memory changes memory cells, due to the high voltage required to store electrons (or remove them).

This could cause excess power consumption if the iliad is changing the state of the memory card, even when it really isn't in use. I don't suspect this is happening though.

12-06-2007, 04:30 PM	#1
rudysplif Member Posts: 11 Karma: 10 Join Date: Nov 2007 Device: iLiad V2	Unmounting external memory to save batteries?? Will unmounting the CF or SD actually stop power draw and increase battery life?? Or do you have to physically remove the cards?? Are there some other process you need to stop as well? thanks,

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
PRS-650 confused about external memory	terraskye	Sony Reader	15	10-08-2010 09:03 PM
Questions about external memory	siulayhumga	Sony Reader	4	06-17-2009 12:44 PM
PRS-500 Collections on external Memory cards	jakeluck	Sony Reader Dev Corner	39	10-18-2007 09:04 PM
Leave a name tag on your external memory cards	Bob Russell	Lounge	0	02-25-2006 04:36 PM

12-09-2007, 12:13 AM	#2
kurifu Junior Member Posts: 9 Karma: 10 Join Date: Nov 2007 Device: iLiad	I think it is very unlikely that unmounting the devices is going to make,much of a difference in the amount of power consumption, I don't believe this really causes a change in the hardware state, though I am not too sure on the behaviour of the linux kernel to state for certain. Additionally even if you are not using the card and leave it in place, the card itself is not going to use much power, probably consumes only tiny amounts of power (so little you likely wouldn't notice). Flash memory isn't like RAM, what causes flash memory to use noteable amounts of power is when the flash memory changes memory cells, due to the high voltage required to store electrons (or remove them). This could cause excess power consumption if the iliad is changing the state of the memory card, even when it really isn't in use. I don't suspect this is happening though.

Advert