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-   -   SDHC question (https://talk.maemo.org/showthread.php?t=12271)

drk529 2007-11-26 04:54

SDHC question
 
the increasing size and availability of SDHC cards is making me lean toward getting the n800 to serve my multimedia needs. Is there any way to make the n800 and/or a PC recognize the size of your SDHC cards (i.e. 2 16gb cards) as one card? In other words, could either the n800 or your PC recognize your two 16gb cards as one 32gb card? this would probably be useful for copying a large music library or similar tasks.

on another note, does anyone know if free dun is still available for verizon customers? I set up free wap before the new plans were implimented, but within a month of getting my phone/setting it up, free wap and free dun were rumored to be gone.

thanks.

convulted 2007-11-26 08:24

Re: SDHC question
 
You could format both cards as ext2 and mount one inside the other (e.g., mounting the external card as /mount/mmc1 and internal card as /mount/mmc1/more). The only caveats are that, AFAIK, the "Internal Memory Card" and "External Memory Card" links in the file browser point to the first partition on each card, if this exists. In other words, you will have to set up the links to the cards yourself. No big deal. Moreover, Windows will not be able to read from/write to the cards.

ssam 2007-11-26 08:36

Re: SDHC question
 
it would probably be possible with maybe UnionFS, RAID or some similar filesystem trick.

you would probably need to know linux pretty well, and it may require making a custom kernel with the extra required modules.

its probably not worth the effort.

convulted 2007-11-26 09:02

Re: SDHC question
 
Just to say that what I suggested requires nothing other than a stock N800 with X-Term installed.

drk529 2007-11-26 12:19

Re: SDHC question
 
Quote:

Originally Posted by convulted (Post 99989)
You could format both cards as ext2 and mount one inside the other (e.g., mounting the external card as /mount/mmc1 and internal card as /mount/mmc1/more). The only caveats are that, AFAIK, the "Internal Memory Card" and "External Memory Card" links in the file browser point to the first partition on each card, if this exists. In other words, you will have to set up the links to the cards yourself. No big deal. Moreover, Windows will not be able to read from/write to the cards.

1. Is that to say that, once changing some settings using xterm, the n800 should function "normally", with one card mounted in the other?

2. So this would prevent windows from reading? my priority would be for Windows (over the n800) to view the two cards as the same card. Can this be accomplished?

yabbas 2007-11-26 13:22

Re: SDHC question
 
You have MP3s larger than 16GB O_O????

TA-t3 2007-11-26 14:36

Re: SDHC question
 
Mounting one card inside another won't give you twice the size, it would still be two filesystems. With unionfs and LVM (a raid tool) as ssam said, could work. But it'll probably need some work.

sevo 2007-11-26 15:06

Re: SDHC question
 
Quote:

Originally Posted by drk529 (Post 100027)
1. Is that to say that, once changing some settings using xterm, the n800 should function "normally", with one card mounted in the other?

With "some setting" being "loading a logical volume manager or unionfs kernel module, creating a new file system spanning both devices and reconfiguring the entire system to such a deviant use of removable slots", yes. Nested mount points as recommended by convulted won't extend the file system, but the directory structure.

Quote:

Originally Posted by drk529 (Post 100027)
2. So this would prevent windows from reading?

Yes - worse than that, even any unpatched Linux. Volume spanning across removable volumes is a fairly stupid idea - you'd have to strip the system of all removable drive handling, as anything that triggers hotplugging of one device (or both devices in the wrong order) might destroy your data or create a deadlock. Windows does not permit it at all, and in Linux (which is more generous about letting you shoot yourself in your own foot) you'd have to work around all safeguards to make it work...

drk529 2007-11-26 20:22

Re: SDHC question
 
ok, it sounds like it would be best to just manually split my media across the cards. i'm thinking of getting the n800 for $200 from buy.com and getting one 16gb card. i think i'd rather get one 16gb card than two 8 gb cards so i can expand it further if i need to.


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