Document geometry limits.

diff --git a/memdisk/memdisk.doc b/memdisk/memdisk.doc
index 64d19df..e7a79e7 100644 (file)
--- a/memdisk/memdisk.doc
+++ b/memdisk/memdisk.doc
@@ -46,12 +46,16 @@ image should be partitioned for proper operation.
 You can also specify the geometry manually with the following command
 line options (currently untested):
 
-   c=<number>  Specify number of cylinders
-   h=<number>  Specify number of heads
-   s=<number>  Specify number of sectors
+   c=<number>  Specify number of cylinders (max 1024[*])
+   h=<number>  Specify number of heads (max 256[*])
+   s=<number>  Specify number of sectors (max 63)
    floppy      The image is a floppy image
    harddisk    The image is a hard disk image
 
+
+[*] MS-DOS only allows max 255 heads, and only allows 255 cylinders
+    on floppy disks.
+
 If you want to recompile it from sources, you will need to make sure that
 you have a fairly recent binutils installed.  I have been using the
 binutils-2.11.90.0.8-9 RPM from RedHat.