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The INT 13 extensions provide a mechanism for accessing disks using linear (LBA) rather than C/H/S addressing. SAN protocols such as iSCSI invariably support only linear addresses and so iPXE currently provides LBA access to all SAN disks (with autodetection and emulation of an appropriate geometry for C/H/S accesses). Most BIOSes will not report support for INT 13 extensions for floppy disk drives, and some operating systems may be confused by a floppy drive that claims such support. Minimise surprise by reporting the existence of support for INT 13 extensions only for non-floppy drive numbers. Continue to provide support for all drive numbers, to avoid breaking operating systems that may unconditionally use the INT 13 extensions without first checking for support. Reported-by: Valdo Toost <vtoost@hot.ee> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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