Date   : Tue, 16 Jul 1985 12:47:55 GMT
From   : Stephen King <king%dciem.uucp@BRL.ARPA>
Subject: Re: using both side of disks

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Another consideration is the index hole, which is not going to
be in the same place if the disc is flipped over. Thus, the disc drive
must be able to cope with the index hole on the other side of the disc
center line, or discs with two center holes must be used. (has anyone ever
seen any of these?)

-Another note- the certified side of a disc is *not* the side with the
label on it. When inserting a disc into a drive with the label up,
the read/write head accesses the disc surface through the slot in
the *underside* of the disc jacket.

                                       -=-=-= sjk