so why the fear?-)
Though one should note that there might be and are platform-specific limitations on O_DIRECT usage, for example specific user-land buffer alignment on Linux. Then O_DIRECT for write (e.g. when generating image) should be used with caution even for other reasons (i.e. in addition to low memory condition). Either way [as already mentioned] I reckon O_DIRECT makes a lot of sense for serialized image burnings, which is also considered most common scenario for image burns. A.
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