Disk failure detected, but not logged or reported (by email)

"Disk Failure" is the first alert listed, and in fact you can't disable it (the option is checked, and greyed out).

I'll contemplate upgrading the firmware, but I've had bad experiences with that in the past (lost a lot of customized settings and applications) and would prefer to try and solve the issue from the back-end. Plus the changes in 4.2.16 and newer that make impossible to downgrade make me nervous since I no longer have enough space to fully backup the NAS.

I don't have the SMART codes from the NAS (obviously - since it detected the drive as dead). But here they are from HDDScan.

Model: ST31500341AS
Firmware: CC1H
Serial: 9VS3AQRR
LBA: 2930277168

Report By: HDDScan for Windows version 3.3
Report Date: 9/5/2012 9:13:03 PM


 Num  Attribute Name  Value  Worst  Raw(hex)  Threshold  
 001 Raw Read Error Rate  117 099 00000009B2-4A8A 006 
 003 Spin Up Time  100 092 0000000000-0000 000 
 004 Start/Stop Count  100 100 0000000000-024A 020 
 005 Reallocation Sector Count  100 100 0000000000-0000 036 
 007 Seek Error Rate  082 060 0000000A56-3097 030 
 009 Power-On Hours Count  075 075 0000000000-5742 000 
 010 Spin Retry Count  100 100 0000000000-0002 097 
 012 Device Power Cycle Count  100 100 0000000000-0024 020 
 184 End To End Error Count  100 100 0000000000-0000 099 
 187 Reported Uncorrectable Error  100 100 0000000000-0000 000 
 188 Reported Command Timeouts  099 099 0000010001-0001 000 
 189 High Fly Writes  001 001 0000000000-02F5 000 
 190 Airflow Temperature  075 049 25 C  045 
 190 Airflow Temperature Minimum 075 049 25 C 045 
 190 Airflow Temperature Maximum 075 049 25 C 045 
 194 HDA Temperature  025 051 25 C  000 
 194 HDA Temperature Minimum 025 051 19 C 000 
 194 HDA Temperature Maximum 025 051 49 C 000 
 195 Error Rate 042 028 00000009B2-4A8A 000 
 197 Current Pending Errors Count  100 100 0000000000-0000 000 
 198 Uncorrectable Errors Count  100 100 0000000000-0000 000 
 199 UltraDMA CRC Errors  200 200 0000000000-0000 000 
 240 Heads Flying Hours  100 253 345ECC0000-570E 000 
 241 Total Host Writes  100 253 0000002F48-4C93 000 
 242 Total Host Reads  100 253 00000026E0-F00A 000