DOS ain't dead - Volumes vs physical storage media

Volumes vs physical storage media | WAS "Protectmod handl" (Developers)

posted by DOS386, 28.08.2010, 01:26

> Do you have a specific protocol in mind? If this is something you're
> wanting, you probably need to come with a design/API/protocol and

under progress :hungry:

> do an initial implementation for BIOS/kernel provided drives. Like I
> stated earlier, if I did it for USBDRIVE I would limit my scope to USB
> disks, and it sounds like you want much more than that.

Knowing whether 2 volumes are on same USB HD (use big buffer) or not would be useful.

> I'm guessing that you are referring to a drive using its internal buffers
> to do the copy instead of actually transferring the data across the bus
> into RAM and back across the bus again? If that's the case, it would take
> much more intimate knowledge of how the disk works than the
> volume-to-physical relationships. You would have to know specific hardware
> details, like whether the disk even has an internal buffer that you can
> manipulate or not (e.g., USB flash drives don't, but USB-attached hard
> drives might).

Interesting, but not what I was referring to.

When copying to the same HD, you preferably use a BIG BUFFER (say 16 MiB), while in other cases (HD0->HD1, HD0->RAMDISK, HD0->USBstick0, USBstick2->USBstick2, ...) a small buffer (say 64 KiB) would be sufficient and maybe even faster.

Also storage media durability should be reported (true for HD, sticks, floppy, false for RAMDISK).

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