Disk no longer valid

[Paul Hoffman]

Greetings. After rebooting a system that had been up for quite some 
time, I could not get the second drive (da1) to mount. The drive 
worked fine before I rebooted. dmesg reported:

. . .
da1s4: rejecting partition in BSD label: it isn't entirely within the slice
da1s4: start 63, end 71132959, size 71132897
da1s4d: start 0, end 71132959, size 71132960
. . .

When I tried to access the disk, dmesg said:

. . .
(da1:ahc0:0:1:0): SCB 0x36 - timed out
>>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<
ahc0: Dumping Card State while idle, at SEQADDR 0x9
Card was paused
ACCUM = 0x0, SINDEX = 0x1e, DINDEX = 0xe4, ARG_2 = 0x0
HCNT = 0x0 SCBPTR = 0x17
SCSIPHASE[0x0] SCSISIGI[0x0] ERROR[0x0] SCSIBUSL[0x0]
[ lots more debugging info]
>>>>>>>>>>>>>>>>>
sg[0] - Addr 0x706d000 : Length 4096
sg[1] - Addr 0xdb6e000 : Length 4096
(da1:ahc0:0:1:0): Queuing a BDR SCB
(da1:ahc0:0:1:0): no longer in timeout, status = 34a
Feb  5 00:01:03 above /kernel: <<<<<<<<<<<<<<<< Dump Card State 
Ends >>>>>>>>>>>
>>>>>>>
(da1:ahc0:0:1:0): Invalidating pack
. . .

The drive was inaccessible. I rebooted again. dmesg still says:
. . .
da1s4: rejecting partition in BSD label: it isn't entirely within the slice
da1s4: start 63, end 71132959, size 71132897
da1s4d: start 0, end 71132959, size 71132960
. . .

but now I can access the disk fine.

Can I fix the drive without losing the information on it? If so, how?

--Paul Hoffman