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eMMC or SD better for Pismo 500 down to PB190 . . .

eMMC is by and large only available integrated into a system. It's basically SD but configured so it can be booted from. I don't know off hand of any IDE to sd adapters, but it's possible they've since been developed and I just haven't had occasion to look yet. If they existed, they'd be good enough for the Classic Mac OS.

For 68k and early PPC powerbooks, CF should be fine. The later you go, for any potential you'll want to run OS X, you'll want to start looking at things like mSATA and m.2 adapters to use "real" SSDs. I would place that threshhold either at pismo (because I wouldn't run OS X on anything older) or just stick with the 'for OS X' guideline.

 
Thanks for the info, I figured the the speed of eMMC would be bottlenecked at the IDE implementation of the NuBus Architecture 'Books. Found some interesting discussion about upgrading to eMMC vs, SD for speed out in the Pi-verse. I took a better look at the module I was considering and it's looking more like a proprietary interface.

I've got an Intel ATOM board with a "PCI  Express Full Mini" slot that's used for WiFi modules. I snagged a cheap 5GB Solid State drive of some sort for that slot and a 2.5" IDE HDD adapter for it seven or eight years ago for PowerBook playtime. I figured for $20 a 32GB card might be fun. The form factor/interface "looks right" but the mounting holes are a non-standard configuration, so I never bothered counting pins or researching further.

I got a real kick when searching around though, someone is listing the eMMC module for my $200 HP Notebook at $500! :lol:

 
I'd never seen eMMC on modules, but it may also be mislabeled PCIe or mPCI, if it's, say, for a Dell mini9 originally, or it may be an M.2 module that is a bit closer to a "real" SSD. Most systems (I've researched in detail) with eMMC are built using a module on the motherboard, so it's interesting to see it modularized into an m.2/mpcie-like/msata  slot. That system instantly becomes more interesting if you can upgrade it to a 128GB module, even if that costs almost as much as the machine itself.

(see also: original iMac, appropriate USB adapters, big external SCSI disks.)

eMMC, like a lot of other technologies, isn't a single thing, either. It (as with regular SSDs) comes in different quality grades and different speed ratings. The Surface 3 I have uses a 128GB eMMC for its boot volume, and it's noticeably slower than a "real" SSD but it's still not "bad" per se.

 
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