Nortel Meridian 1 Planning, Installation And Operating Instructions page 304

Chapter 20 — Meridian Mail Compact Option installation and maintenance
2
3
Option 11C Compact
If Meridian Mail Compact Option starts, attempt the comprehensive
upgrade procedure again. If it fails a second time, restore the system
and attempt the procedure again but with a different software tape.
or
If Meridian Mail Compact Option does not start correctly, follow the
trouble-shooting procedures beginning on
Replace the disk drive on the mail card, restore the system, and
attempt the expansion or upgrade procedure again.
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Planning, Installation, Fault Clearing and CCBR Guide
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page 280.