Index: block.c
===================================================================
RCS file: /cvsroot/qemu/qemu/block.c,v
retrieving revision 1.10
diff -u -r1.10 block.c
--- block.c	14 Jul 2004 17:20:30 -0000	1.10
+++ block.c	23 Jul 2004 15:12:21 -0000
@@ -311,6 +311,7 @@
 {
     int ret, n, fd;
     int64_t offset;
+    int bytes = 512;
     
     if (!bs->inserted)
         return -1;
@@ -320,7 +321,7 @@
             fd = bs->cow_fd;
             offset = bs->cow_sectors_offset;
         } else if (sector_num == 0 && bs->boot_sector_enabled) {
-            memcpy(buf, bs->boot_sector_data, 512);
+            memcpy(buf, bs->boot_sector_data, bytes);
             n = 1;
             goto next;
         } else {
@@ -335,8 +336,11 @@
             offset += sector_num * 512;
             lseek64(fd, offset, SEEK_SET);
             ret = read(fd, buf, n * 512);
+	    
             if (ret != n * 512) {
-                return -1;
+		if (ret == -1)    
+	                return -1;
+		bytes = ret;
             }
         }
     next: