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I made a 1.8" to 3.5" cable. I took a 3.5" ide lead and chopped the end off so I had the 3.5" connector with about 8" of cable attached.
The 1.8" connector pins are the same pitch as compact flash so I used an old compact flash card for its connector. Old compact flash cards should be available on ebay for peanuts if you don't have one.
I then googled for pinouts for both drives and set about soldering the wires from the cable to the correct pins on the compact flash connector.
As noted you would also have to power the drive. I'm sure 2.5" drives are 5v which would make it simpler since you could use the same power supply for the player and the drive. I think the iriver supply should be able to provide enough current for both the player and drive.
I don't know if there is a limit to disk size and what it is. I found 80gb to work perfectly but I don't have any bigger disks to test.
The cheap webhost the photos where on appears to have disapeared and I don't think I have any backups. I can probably find the cable and get some pics of that if it would help.
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