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IZwack's car-PC


Nick26

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There is actually no need to defrag at all, by any means. Placing data in continuous segments to minimize read head movements while reading a file has no effect when there is no read head or any other moving parts...

The other benefit of defragging is the combining of small chunks of free space due to them being part of a cluster that is only partially used. Nowadays, with avg file size much larger than the avg cluster size, this has become less of an issue.

So I guess what I'm saying is don't defrag, by any means, when you have a SSD. It won't help, and it may cause harm.
He's right, in addition I will just point out that the blocks on a SSD drive have a finite number of write cycles so defragging would essentially just be wasting write cycles for no reason at all. Not to mention the low level memory controller won't actually put the data for the files in order because it doesn't have any concept of files and just writes this bit here, that bit there, everytime i gets more new data.
 


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IZwack

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Like I mentioned before you could have probably gotten away with a compact flash card and a SATA adapter. But anyway each PEB on those drives has a minimum of 100K writes, and with wear levelling of 30GB, and the kernel's file system caching you should be find for a very long time.
I was wondering about that - would the throughput of a CF via SATA be as fast as this SSD?

And also, arent CF cards (and other formats) also MLCs (multi level cells) like this one I have?

If the info on this link is correct, then here is an SLC SSD that is about the same price and size: http://www.avadirect.com/product_details_parts.asp?PRID=10922
 




Nick26

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CF cards wouldn't be as fast and don't have as many write cycles(depending on make and model), but cost wise might have been cheap enough to justify it if you only wanted like 3Gb anyway. If you wanted a small second backup drive you could make one and keep it around.
 








jad2411

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I've been loking for a think client pc, I'd run diagnostics, GPS, and AV, I'm thinking of getting a USB wireless network adapter that way I could connect to my house for upgrades or whatever I need to.
Those PC's use a 12V source, so I think it would be easy to use it for in-car applications, I still have to do some reading and I need $$ to fund this project hehehe
 




IZwack

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Got megaTunix talking with MegaSquirt. I ripped out the hard wired IAC so I didnt get to test that, but I'll resolder sometime and play with it.

Screenshot: http://izwack.com/dump/Screenshot.png

As of this posting, MegaTunix supports firmware version .888 where as MegaTune supports .890 (Monitor_v2.888a.abs.s19 - vs - Monitor_v2.890.abs.s19) . With the two difference versions, Tunix couldn't [or wouldn't] read from the ECU properly. So MegaSquirt had to be reattached the Windows laptop, rewrite the older firmware to the ECU, reattach into the Linux machine, and finally MegaTunix was able to read from the ECU.
 
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cybergasm

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So is the Motor running on this now or not yet?
 




IZwack

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Of course not :). The way the schedule is running, the engine will crank when the last autumn leaf falls in 2009.
 




SVO

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Of course not :). The way the schedule is running, the engine will crank when the last autumn leaf falls in 2009.

Sounds like a race.............


Will I get my junk running first or you???







Jeff - :navajo:
 




IZwack

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Will I get my junk running first or you???
You're a teacher, you've got underlings to your disposal. Use them!
 




Rick

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Sounds like a three way race. I am hoping to light the fire in my project about the same time Iz is planning for:D
 




SVO

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You're a teacher, you've got underlings to your disposal. Use them!

Funny you say that.

We're not allowed as "staff" to work on our own junk up at school, it is forbidden, and constitutes grounds for termination, so unfortunately this means I have to do all the work here at the house.

Hanging out with current students also applies to the above.


I guess I could send invites to Froader, Sextion, Jamest, and Josh and go buy stock in Shiner Brewery.






Jeff - :navajo:
 




95exploderboy

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Just came accross this guy while looking around for pc parts today. Would something like this have worked for you as well? I'm thinking of getting one to mess around with just for fun.
 




IZwack

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Yeah but it might be a bit more tricky since thats not an x86 design like the Intels, AMDs and such.
 




95exploderboy

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Got it, I don't really know enough about the MS and this board, but just thought that this thing was pretty cool.

Back to my beagleboard research now...
 




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