Depend, you can also use hibernate and standby (if you drive the car often).
I am working on putting together a carpooter. There is one thing that concerns me. I am wondering how is the system booted. Each time the car starts is it booted from a cold state? Do people leave it in standby? I am wondering because if I get in my car and drive a couple of miles and back, is half that time going to be booting the computer before I can listen to anything? This is a 1Ghz EPIA board I can't imagine that it boots all that quickly. What are you boot times?
Bios is generally the worst part of any PC setup boot time @ 8 - 15 secs. It's a factor if you cold boot or hibernate. Standby on the other hand is about ~2 secs, much better. The only problem is battery life... However, some car PSUs (Opus 150 for one) actually leave the 5vsb line powered unless physically disconnected, even when off or hibernating, and that can be 95% of the draw of a PC in standby... have a search around an see what others are doing.
FYI I currently hibernate, but may change that to standby for periods of less than 3 days.
i currently hibernate (which doesn't drain any power as long as you cut 2 of the wires between psu and motherboard), using a 1Ghz athlon it takes about 10 seconds to hibernate and 25 to resume (to music playing)
i have been testing some new kit (a P4 - which i may not be able to run full power anway) and that hibernates in 4 seconds and resumes to music playing in 15 seconds
so your journey definately does not have to be all booting
also you could couple hibernate with a remote start of the pc (i'm doing this with my clifford alarm but there are probably other ways to do it) and you could be listening to music before a cd would have started in your original head unit
What do you mean by "cut" two of the wires? Is this a physical cut or a switched cut?Originally Posted by GreenBeast
He means that power is removed from the mix. Probably automatically. I couldn't imagine using a physical switch to cut power unless it was something drastic. Having said that, it is a good idea to have a way to totally remove power so that you don't have to pull the car over just in case your carpc gets in to a state that is unresponsive to anything but a total removal of power (like pulling the plug on a home system).
when the pc is off,the ATX specification says that usb devices should have a trickle of power
what i mean is i have two relays wired into two of the ATX power wires so that when the systemhibernates (turns off) then the 5vstb and 5v lines are cut...that stops power drain while pc is off
have you any more info on this, maybe pics of how you did it, it sounds like what im looking to do, as im concerned about battery drain. thanks