New Information:
----------------
As an experiment, I used pdisk to delete the 14th partition, named
"MacShared". I then recreated it with the command:
C 14p 14p MacOS Apple_HFS
and wrote the changes to disk. I then rebooted.
When OS 9 finished booting, I saw the second disk icon still there, and
it was still named "MacShared". So I pulled up pdisk to see what it
thought about the partitions, and it shows:
Partition map (with 512 byte blocks) on '/dev/ata0.0' (/dev/hda)
#: type name length base ( size )
1: Apple_partition_map Apple 63 @ 1
2: Apple_Bootstrap boot 1600 @ 12654848
3: Apple_Driver_ATA*Macintosh 54 @ 64
4: Apple_Driver_ATA*Macintosh 74 @ 118
5: Apple_Driver_IOKit Macintosh 512 @ 192
6: Apple_Patches Patch Partition 512 @ 704
7: Apple_UNIX_SVR2 swap 524288 @ 1216 (256.0M)
8: Apple_UNIX_SVR2 / 153600 @ 525504 ( 75.0M)
9: Apple_UNIX_SVR2 /tmp 51200 @ 679104 ( 25.0M)
10: Apple_UNIX_SVR2 /usr 3276800 @ 730304 ( 1.6G)
11: Apple_UNIX_SVR2 /var 512000 @ 4007104 (250.0M)
12: Apple_UNIX_SVR2 /home 1024000 @ 4519104 (500.0M)
13: Apple_HFS "MacOS" 6963200 @ 5543104 ( 3.3G)
14: Apple_HFS "MacShared" 148544 @ 12506304 ( 72.5M)