disk_read (src, sector++, buffer);
if (file_write (dst, buffer, chunk_size) != chunk_size)
PANIC ("%s: write failed with %"PROTd" bytes unwritten",
disk_read (src, sector++, buffer);
if (file_write (dst, buffer, chunk_size) != chunk_size)
PANIC ("%s: write failed with %"PROTd" bytes unwritten",