>>>This is the device..
>>>
>>>http://www.dpreview.com/news/1006/10062301sandiskwormsd.asp
>>>
>>>There are apparently only a handful of specialty cameras that will write to it. My client needs to write to it from a PC based camera.
>>
>>http://www.sandisk.com/business-solutions/sd-worm
>>http://vmqaweb.sandisk.com/Assets/Umbraco/SDWorm/Documents/SanDisk%20SD%20WORM%20Fact%20Sheet.pdf
>>
>>It looks like that card is specifically designed for archiving of legal evidence.
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>>IANAL but I suspect SanDisk must make the device able to withstand a legal challenge as to its tamperability. If I were SanDisk I would:
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>>- require specialized hardware to write to the card - perhaps a non-standard SD slot and custom controller hardware
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>>- limit the number of licensees allowed to manufacture or use this hardware to the smallest number possible
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>>- make sure I had iron-clad legal agreements with those licensees
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>>My guess is if you want to write to that SanDisk card using a different device, you'd have to come to some sort of OEM/licensing agreement with SanDisk. Only after that would they open the kimono and give you access to the required hardware and SDKs. Then you'd have to develop the hardware and software to meet your needs. That is likely to be time-consuming and very expensive.
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>>If your client really wants to use that SanDisk card, I'd get hold of one or more of those specialty cameras and check out their interface options. I can think of a couple of options that might work:
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>>- if the camera has a USB interface, plugging it into a PC may make its card slot appear as the next drive e.g. H:. You might be able to write files to it using Windows Explorer. Come to think of it, this probably won't work because for legal requirements you'd want to be certain that the contents of the card came through the camera's lens and were processed within the camera. Being able to write arbitrary files from other sources would violate this.
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>>- there may be software that lets you control the camera from a remote PC. IOW the camera is still taking the pictures, but under the direction of a PC.
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>>Can you explain further the "PC camera" you mentioned? If you mean something like a webcam attached to a PC, I don't think you'll ever get SanDisk to agree to something like that. For legal evidence you need to have a well-defined, unalterable and auditable path between the image entering the camera lens and the image file stored on the card. That's not too hard to achieve with a digital camera and its embedded OS, but pretty much impossible with a general-purpose OS such as Windows.
>
>I am not privvy to what or where these cameras are. I'm assuming these are safety/security camera systems that the client (BNSF Railway) uses or will use to protect itself in court.
>
>The request for drivers came down the food chain to one of the departments I consult for. My assumption is that they can get any license agreements handled w/o problem if needed. I also assume they can get specs for the interface w/o problem.
>
>What they need is someone to write the driver(s).

You probably need specialized hardware to write to those cards, and probably only SanDisk makes that hardware, and almost certainly they only sell it to OEMs such as FujiFilm, Pentax etc. Without that hardware you can't even think about device drivers, so you definitely need to talk to SanDisk first. You might find, for example, that for legal reasons SanDisk has to write the device drivers for that card and its associated custom controller, so looking for device drivers anywhere else may be moot.

Bottom line, if they haven't already talked seriously with SanDisk, they need to do that first.

If BNSF is really dead-set on using these cards, I'd look real hard and jump through lots of hoops trying to make one of the existing specialty cameras work. Think custom environmental housings, lens adapters etc. If they're looking at hundreds or thousands of units, that might be enough to interest Fuji, Nikon or Pentax into offering help.