Speaking of getting the hourglass to disappear in practice- that will depend on a lot of factors, like you mentioned, including the shooting settings selected, buffer usage, file size, and file format. The most notorious setting is distortion correction, which adds over a second of processing time
per frame.
If you want to measure the write speed, it's best to shoot a burst of several frames to minimize the impact of timing errors and in-camera processing overhead. If using JPEG mode, lens corrections and highlight corrections should be disabled, though keeping the camera in RAW mode is best. The timer should be started as soon as the SD access light comes on and stopped as soon as it disappears.
Having done my fair share of these tests, I can tell you that the K-5 maxes out at a write speed of roughly 30 Mb/s. Most UHS-I cards these days should easily be able to sustain that speed, thus outperforming the camera. Class 10 cards could be anywhere between 10Mb/s and 30Mb/s, whereas lower class ratings should correspond to their labeling
I would strongly recommend using at least a class 10 card for good everyday performance, otherwise the camera will be locked up to write for way longer than necessary.
Here's a little demo featuring the K-5:
Adam
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