Am Mon, 23 Mar 2015 12:07:44 -0700 schrieb Matthew Dharm <mdharm-usb@xxxxxxxxxxxxxxxxxx>: > Marc -- > > In re: why behavior is different at boot-up vs hotplug -- have you > considered the possibility that your BIOS sends a READ_CAPACITY > command to the drive during POST? If you BIOS is enabled for > boot-from-USB (and most are), then it likely probes the device to > compile a list of boot targets, before later trying each target in > turn. > > Heck, depending on how your BIOS is configured, it might access each > bootable device to determine if it's a "legacy boot" or "UEFI boot" > (or both!) configured device. > > That access, or series of accesses, might trigger some sort of > "compatibility" behavior in the drive; I'm guessing a lot of BIOSes > don't support 4k sectors yet, so a feature like that might actually be > useful to some people. > > You might try to see if you can disable USB boot in your BIOS, and see > if that makes any difference to the behavior of the drive at all. Right, I did think of that, but forgot to mention that beforehand. My mainboard is an Asus M2N-E from 2006 (http://www.asus.com/Motherboards/M2NE/), which has the curious property of not supporting boot-from-USB (only internal HDD, CD, and floppy), but supporting BIOS updates from a USB stick. Almost there, but not quite... Of course, there's always the possibility of a BIOS bug, but I have a hard time imagining that to be the case (though that's just my gut feeling). I could deactivate boot-from-CD just in case, but don't expect that to change anything. -- Marc Joliet -- "People who think they know everything really annoy those of us who know we don't" - Bjarne Stroustrup
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