HDD problem

Hello, I have a disk problem, i suppose, as during boot, the system some times freezes with "kernel pannic" and some times boots normally.

In this is peace from the log:

                  
Jun 16 14:41:00 b kernel: libata version 1.20 loaded.                                                             
Jun 16
 14:41:00 b kernel: sata_promise 0000:00:08.0: version 1.03                                                 
Jun 16 14:41:00 b kernel: sata_via 0000:00:0f.0: version 1.1                                                      
Jun 16 14:41:00 b kernel: ata3: dev 0 cfg 49:2f00 82:346b 83:7d01 84:4003 85:3469 86:3c01 87:4003 88:407f         
Jun 16 14:41:00 b kernel: sda: Mode Sense: 00 3a 00
 00                                                            
Jun 16 14:41:00 b kernel: sda: Mode Sense: 00 3a 00 00                                                            

can You just tell me the meaning of this "sda: Mode Sense: 00 3a 00 00" ?
Nothing else interesting i havent seen in logs, but when googled for this "mode sense", all the docs i have fount was related to disk problems.


Thanks in advance !
Best regards !