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Prefetch/Undefined Instruction/Data Abort Errors... cheap refurb as cause?

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jwalker1196:
So I just bought a refurb'd 5.5gen 80gig. Loaded music, started running into those crazy data aborts, undefined instructions, and prefetch errors. So I got thinking, did a little playing around, and arrived at the following.

Idk if there are 2x32MB RAM chips and one is broken, or if the punk amazon storefront I bought it from repaired mine using 5th-gen hardware, but as soon as I add enough songs to my playlist to get the buffer around 28 - 29MB, it does the little blip of loud static and displays one of those errors. (I'm sure the remaining 3MB or so is the directory cache, the program, etc.)

I'm assuming I can install the 32MB build, but that'll defeat 1/2 the purpose of this new ipod (better battery life).

Is my train of thought correct on all above counts? Someone with expertise on the internals and what is actually possibly going on would be sweet. I plan on contacting the seller and demanding one with the correct hardware, so if this is just a rockbox bug that I can fix that'd be sweet to know, before I go postal on an amazonian

(Their refurb sucked anyway... 12 dead pixels, the screen color balance is effed anyway (cheap LCD) and the click wheel is sticky and "squeaky".)


--edit: also idk if this would really go better in hardware... lemme know, feel free to move it, etc etc

--edit 2: went to install the 32MB one, and just out of curiosity, hit autodetect... it gets detected as a 30-gig. Relevant? It works fine, btw. I'm sure with the smaller cache my battery life will be garbage.

gevaerts:
Refurbished ipods with only 32MB are pretty common, so this is very probably your problem.

Autodetect currently doesn't detect RAM size, soit always installes a 32MB build to be safe.

GodEater:
On the plus side for you, the difference in battery life between a true 64MB iPod and a 32MB one are neglibile.

The 64MB iPod spins the disc up less often, true, but it has to spin it up and use it for longer to fill the bigger buffer, so I doubt you'll notice much difference.

jwalker1196:

--- Quote from: GodEater on July 08, 2009, 05:27:54 AM ---On the plus side for you, the difference in battery life between a true 64MB iPod and a 32MB one are neglibile.

The 64MB iPod spins the disc up less often, true, but it has to spin it up and use it for longer to fill the bigger buffer, so I doubt you'll notice much difference.

--- End quote ---

The battery life times between the 5th gen and 5.5 is pretty dramatic... like 12 hours vs. 18. Particularly when playing FLAC and such where it might have to read more than once per song even. And anyway it's not maintaining the 4200rpm that's rough on the battery, it's the acceleration that's the power draw. Having to do that 1/2 as often will help a ton.

If it's not the RAM size that affects this, what is? Since I seem to have a 5th gen main board, I can only assume I'll have 5th-gen battery times. Or is the battery in the 5.5-gen also of larger capacity?

AlexP:
The RAM doesn't make that much difference.  The 64 MB model has a bigger battery.

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