同時提到iPod的硬碟,不錯看!!!
懶得翻譯,當作大家動腦筋的參考,很抱歉link忘了,已經標示作者.不敢掠美.
Tango
找到了! 耐心從第一頁讀完, CF Card 的問題也差不多解決了!!
http://www.stevesforums.com/forums/view_topic.php?id=22672&forum_id=52&page=1
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Ok folks, here's some answers.
FAT16 vs. FAT32 is a separate issue. Sure, you may have problems if you plug
a microdrive or CF card formatted as FAT32 into a camera that can only handle
FAT16.
But the iPOD Mini disk issue(s) are different, and are at the hardware interface
level...
Most all CF storage cards/HDDs support several styles of interface: 'TrueIDE'
(essentially just like an IDE hard drive but different connector) and 'CF mode'.
[Sometimes TrueIDE mode is called TrueATA mode.]
CF mode is essentially subset of the older, now-superseded "PCCard" standard.
But it is possible (but rare) for a device to be in a CF form factor but not run
in a CF mode - in this case, the iPod mini Hitachi HDDs. These drives are
also not marked with the "CF" logo (unlike consumer-available Hitachi CF HDDs).
[The new successor to CF mode, "CF+" is similar, but has TrueIDE mode support
as an option and is not mandatory (unlike orig. CF mode, which mandated the
support of TrueIDE).]
These IDE vs. CF interfaces are different in electrical signalling, and the support
firmware needed to 'talk' with these devices must differ for these various modes.
For storage cards, CF mode allows the disk's 'taskfile' (IDE control/command
registers) to be accessed in either Memory-mapped or I/O-mapped modes:
this latter I/O-mapped mode can be in 'Contiguous 16' mode or a Primary +
Secondary taskfile mapped mode.
All these modes have similarities - to programmers, there's not huge differences
between these. (Kinda like walking into your living room thru any of four different
doors: you still end up in your living room.) But things are arranged/wired/timed
a bit differently amongst these modes, and they are not interchangeable. A card
or Microdrive that can run in only one mode cannot be accessed if the driving
hardware can only run in one of the other modes.
A couple of things to know:
- A plain PC IDE port run to a CF connector (like those older PCCard adapters
having no ICs, just a 40pin cable to a PCB connector) can't talk to a CF device
if that device only runs in a CF mode. This setup can only run the CF card
in TrueIDE mode. So it's entirely logical that an iPOD Mini 4GB drive reads,
writes and formats just fine on a PC but will not work in a camera (which
does not use TrueIDE mode).
- There's no telling how a PC's USB-based CF card reader will access a
CF memory card or a CF microdrive. It might try IDE or CF modes, or
only one. This could be a hardware issue (internal wiring ), issue w/
internal firmware inside the USB card reader chip, and/or the Windows
or Linux driver on the PC.
Thus, some USB readers may be able to read an iPOD Mini microdrive (non
-CF), (because they run reader in TrueIDE mode) while other readers
cannot because they always try to run the CF device in CF mode.
- if camera's firmware can only run the CF slot in one mode and that mode
is not supported by the CF card, you ain't gonna talk to the device.
- it takes a tad of firmware to configure a CF slot in any of these modes;
the hardware just doesn't do its thing miraculously;
- it appears many digital cameras apparently talk to CF memory/HDD cards
in a CF mode and not in "TrueIDE" mode;
- from some very quick experimentation on a test bed, the Apple iPOD Mini
4GB drive from Hitachi apparently DOES NOT support _ANY_ CF mode
and is a TrueIDE-only device. (thus explaining there's no CF logo!!!)
This was apparently a cost-down effort; saves some support, testing,
wiring, EMI/RFI issues, etc. (TrueIDE mode requires under 40 pins as
opposed to 50 pins on CF..)
I dunno about the newer 6GB drive but I suspect it's similar.
Anyway bottom-line: unless your digital camera CF slot works in TrueIDE mode, it
will not be able to deal w/a Microdrive taken from an iPOD Mini.
Bill Wiese
San Jose, CA USA
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