Date   : Sat, 20 Nov 1982100:13:00-EST
From   : X.GYRO@Mit-Mc
Subject: [RGF: CP/M disk logins]

    Date: 13 November 1982 00:27-EST
    From: Ronald G. Fowler <RGF>
    Re:   CP/M disk logins

      In fact, once accessed, a disk is considered logged until the
    next warm-boot, even if it has changed.            --Ron

Not strictly true.  There is a "Reset disk subsystem" BDOS call that
will un-log all disks without warm booting.

-- Scott