SD vs SSD

If the cost/size is not an issue and the removable media is not required, then SSD is superior to SD card in every respect.

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant

Not really. They're typically just different interfaces to the same technology. Both SD and SSD are (usually) flash memory exported to the outside world as a block-oriented storage device. In other words, they're flash disks.

That's quite impossible to say, given you didn't say what kind of performance you're intersted in: read or write speed? Peak or sustained speed? Access time? Available overall size?

In terms of speed (especially over lifetime) a lot ends up being not just the native speed of the flash devices, but how they are managed. A device like an SSD with a number of chips well managed can achieve a higher bandwidth than one or two of those chips as in an SD card... or especially any collection of memory badly managed... Some of the early SSDs suffered from such bad management, slowing over time.

Pragmatically? I'd try it out with a cheap SD card or USB stick... if it's fast enough, great, if not go for the more expensive solution.

Thanks very much to everybody for their suggestions. Indeed very helpful.

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