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My comment about the built-in reader should be clear. Basically they are nothing special, so don't use them as a benchmark. The built-in reader is just another USB reader.

By microdrive, do you mean SSD? The SSD drives are quite different from simple flash. If you plan on doing a lot of rewriting, the SSD is the way to go, but they are quite expensive relative to simple SDHC. The deal is the general public accepts SDHC or compact flash cards failing. They don't like it, but these cards are socketed for a reason. SSD goes through great pains to not rewriting the same cells. Some drives even has built in compression to reduce the amount of data fed to the drive.

Well, it should show that they haven't screwed anything up. Flash and USB is a constant, here, so any differences between the built-in reader and the adapter or our widget shows that something is screwed up, rather than a USB bottleneck. I don't care about the performance of a hard disk because I can't have that.

No, a microdrive is a CF form factor hard disk. Apparently they're out of favor these days.

They aren't nearly as popular as SD cards, although they are still doing quite well in "high end" fields such as professional (SLR-type) digital cameras: For quite awhile you could get larger CF cards that you could SDHC cards.

Its days probably are numbered, though. Even Sony finally seems to have largely given up on their proprietary Memory Sticks... which had no technical advantages that I'm aware of but a hefty licensing fee from Sony; hence very few additional manufacturers ever made them.

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Just remembered, another vendor we looked at was SMSC, we never used them in the end as we wanted them to write some custom firmware and they never got back to us, but their product life cycle seems to be a bit longer than the Taiwanese companies. The part we looked at was the USB2241

This one is stocked by Digi-Key, which is a bit more promising.

HTH

A downstream hub is a big bonus for this application so we're planning on using the USB2640 or USB2660 (for two flash devices), at least for a demonstration.

Arrow quoted $2.60 and 16 weeks, which is reasonable for production quantities. We found an eval kit which should satisfy our near-term needs and then see if we can squeeze out a couple of samples for a prototype.