In reply to: Bret Johnson <bretjohn@ju...> >> only support Intel/Via (UHCI) controllers yet.
> True. Working on that. Great :=) >> I also think they have hard coded 512 bytes per sector. > No. USBDRIVE reads the maximum buffer size from the DOS List of Lists (as > discussed some earlier in the thread), and uses that as its maximum sector > size. If a USB disk has 4k sectors, but DOS can only handle 512 byte > sectors, USBDRIVE won't load the disk. If DOS can handle (buffer) 4k sectors > OK, USBDRIVE will load it and automatically mount any FAT partitions it finds. TY for the heads-up. > Also as stated earlier, I don't personally have any disks with sector sizes > other than 512, so this has never been tested (at least by me) on a real > system. It would be a good thing if someone on the list having access to such a device /and/ Intel-based USB would experiment and report their findings... > That's why you need to modify the kernel to handle 4k sectors, also as > discussed earlier (at least with my drivers). Based on what Eric says, > though, that doesn't work with the FreeDOS kernel. As I noted earlier, I'm sure the default disk driver MS DOS kernels can handle bigger sectors, /but/ there are problems to be fixed - as pointed to me by R. Loew, and I verified it too : MSDOS init module (patition scanner) discards partitions whose boot sectors indicate any sector size other than 512. Disks operated through user drivers (config.sys) should not be so limited. While trying a free fix for MSDOS could be attempted - but is the effort worth it ? - I would vote for FreeDOS to be enhanced. Does someone here know if DR/Open DOS recognises >512k sectors, either or both with its built-in disk driver and user drivers ? > Because USBDRIVE provides an INT 13h interface, you can also use external > drivers to mount/access the non-FAT partitions that may be on the USB disks > (NTFS, EXTx, exFAT, ...). USBDRIVE won't mount non-FAT drives automatically, > though. Understood. Regards -- Czerno ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
