Extended partition on SDHC card ? - General Discussion and Assistance - CHDK Forum

Extended partition on SDHC card ?

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Extended partition on SDHC card ?
« on: 13 / July / 2008, 15:22:14 »
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I created 2 partitions on my 16GB SDHC card with the SDM maker ( or whatever it is called ), so now my A650IS is booting up from FAT16 and then storing the pictures on a larger, FAT32 partition.

The issue here is that I don't see the larger partition under my windows. I tried to go to Computer Management and assign a letter to that partition, but windows doesn't want to do it.

Can anyone explain in a simple way how to see that bigger partition under windows ?

Re: Extended partition on SDHC card ?
« Reply #1 on: 13 / July / 2008, 15:44:13 »
Can anyone explain in a simple way how to see that bigger partition under windows ?


Put your card in card reader, start SDM installer, swap partitions and then click 'Folder Open'.

How do you make the FAT16 partition??
« Reply #2 on: 13 / July / 2008, 17:25:03 »
Hate to ask a dumb question but... how do you format the 16gb SDHC card with two partitions, one FAT16 and one FAT32? If I load the SDM maker on the card it doesn't show up when I turn the camera on. I have a 16gb card but can't seem to use the CHDK with it. I have an A720is.

Help appreciated.

Re: Extended partition on SDHC card ?
« Reply #3 on: 13 / July / 2008, 18:26:50 »
thanks microfunguy - that worked like charm. Much love!

Madoleone - not a dumb question, we all have them :)
1) Go to: StereoData Maker , scroll down to pick up your camera from the list.
2) Download the software, unzip it - and follow the installation instructions
3) The software will format your SDHC with 2 partitions and put its own "bootloader" file on the card.
4) Delete the bootlader file and replace it with the CHDK file, that was downloaded from here.
5) Don't forget to lock the card and shove it in your powershot.

done. :)


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Re: Extended partition on SDHC card ?
« Reply #4 on: 13 / July / 2008, 18:34:46 »
Madolenone,

I will leave it to others to explain the details of the software--but, basically, you "partition" the SDHC card into two pieces (partitions). The first partition is small--only large enough to hold CHDK and your various script/other files. That one partition is formated as FAT16 and set to "bootable".

The second partition is large and formated to FAT32 (typically larger than 4GBytes in size).

The camera will see the "first partition" when turned on (and boot CHDK). Then CHDK (I would guess) as it loads, redirects that Camera to write the Image files in the 2nd partition.

Now, when you try to use the two partition card on a Windows computer--for some unknown reason, the software/driver folks assumed that external memory cards would only have one partition--unlike hard drives which are assumed to have one or more partitions.

So--what needs to happen is either you change your memory card driver to look for more than one partition--or use Microfunguy's software. Load up his software and it can "tell windows to look at the second partition instead of the first--swap partition".

Now, when you open your "folder explorer"--it will be looking at the 2nd partition where your images are stored. And if you want to load a new version of CHDK or some script files--you will have to tell Windows to swap back to work on the first partition.

Here is the long, bloody thread, on how people figured the problem out and what to "do to Windows" to make it work:

Autoboot with 8GB and HDHacker Possibillity

Or, you can use Microfunguys SDM installer and save yourself more Windows confusion:

StereoData Maker

Also, there may be issues regarding which cameras can support dual partition boot and which version(s) of CHDK support dual partitions.

The latest mainstream version of CHDK is here (usually works--but is still a beta development build--so save your last working version of CHDK for emergencies):

Index of /hdk/autobuild/

I don't have any 16GB cards--so I cannot help you more.

-Bill

Re: Extended partition on SDHC card ?
« Reply #5 on: 14 / July / 2008, 04:14:38 »
Thanks a lot! I can see this will keep me busy for a while. I am on a Mac and have to left feet when it comes to Windows but I want to see this work. Thanks again.

Re: Extended partition on SDHC card ?
« Reply #6 on: 14 / July / 2008, 14:21:36 »
I am on a Mac


This is unfortunate.  ;)

The SDM installer makes it very easy for Windoes users to make bootable single or dual partition cards with all required files and folders.

It does not work on a Mac.

It will be a lot more difficult.

Re: Extended partition on SDHC card ?
« Reply #7 on: 16 / July / 2008, 15:03:38 »
Actually, since I have access to WindowsXP under Parallels on the Mac it all went fairly smoothly and it's humming along now. Everything works. In addition when I put the SD card in the reader and open it on the Mac side, both partitions show up on the desktop. Very convenient.

The only small glitch is that the 16gb PQ1 card is not as fast as I had hoped and so I can't use the high quality video settings. The (64k) read: 8900, write: 4300

Much thanks for all the help.


Re: Extended partition on SDHC card ?
« Reply #8 on: 16 / July / 2008, 15:22:21 »
when I put the SD card in the reader and open it on the Mac side, both partitions show up on the desktop. Very convenient.

Hmmm ... it is  ... I do not know why that does not work under Windows.


David

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Re: Extended partition on SDHC card ?
« Reply #9 on: 17 / July / 2008, 00:38:45 »
Microfunguy,

...
Now, when you try to use the two partition card on a Windows computer--for some unknown reason, the software/driver folks assumed that external memory cards would only have one partition--unlike hard drives which are assumed to have one or more partitions.
...

It's a Windows problem. No other mainstream OS has this problem.
Canon P&S: 110HS, SX260HS, SX230HS, 2x A720 IS, 2x A590 IS
Canon DSLR: 5D Mark II, 300D IR-converted, 8x glass
MFT: DMC-GF1, DMC-G3, 7x glass

 

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