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sdide: fix issue #69

--- a/sys/src/9/pc/sdide.c

+++ b/sys/src/9/pc/sdide.c

@@ -1194,7 +1194,10 @@

 	outb(cmdport+Features, drive->pktdma);

 	outb(cmdport+Count, 0);

 	outb(cmdport+Sector, 0);

-	len = 16*drive->secsize;

+	if(drive->secsize)

+		len = 16*drive->secsize;

+	else

+		len = 0x8000;

 	outb(cmdport+Bytelo, len);

 	outb(cmdport+Bytehi, len>>8);

 	outb(cmdport+Dh, drive->dev);