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Originally Posted by mtas
Well, you do have the possibility to use two removable media at the same time. What was concerning me was that the size of the internal file system is limited and that the amount of times you can write to a block on it is also limited.
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Endurance for the FLASH memory devices is measured in millions of cycles. The Sandisk Disk on Chip inside the iLiad rotates writes across all of the available blocks inside it to keep the writes spread out over the entire chip instead of hammering away on the same "hot blocks" over and over again.
My understanding is that most CF cards have similar technology.
I created an ext2 4GB Sandisk Ultra III CF card and use that as my "primary" storage on my iLiad. The ext2 filesystem provides all the Unix filesystem goodies: hard links, symbolic links, upper/lower case sensitivity...
I use the internal iLiad storage to hold symbolic links to the CF card.
In my testing the MMC card slot is far slower than the CF slot. I use it to hold my interchange media MMC card and carry a Zio! MMC to USB convertor to turn the MMC card into a USB drive to exchange files with PC's while on the go.
I actually turn off the iLiad's USB port and mass storage daemon to get back memory and power. In my testing the performance is so low that it isn't worth bothering with. The Zio! is tiny and gives USB 2 performance (2 to 20MBps depending upon the MMC card) whereas the iLiad's mass storage mode requires the huge travel hub and yields roughly 1X CD-ROM performance: 153KBps.