Bus Error on Development Server

Hello,

I was trying to process Images with some python scripts, when I receive bus error. After that I had many bus errors on different programs.
Finally I tried to start django' development server, and I received the same error.

I know that this error happens when a process is trying to access memory  that the CPU cannot physically address.    I checked my log files and the output of the error is the following:

T02:13:26.879355+02:00 suse-pc kernel: [ 9976.488797] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0  
2014-03-01T02:13:26.879402+02:00 suse-pc kernel: [ 9976.488806] ata1.00: irq_stat 0x40000008  
2014-03-01T02:13:26.879413+02:00 suse-pc kernel: [ 9976.488813] ata1.00: failed command: READ FPDMA QUEUED  
2014-03-01T02:13:26.879419+02:00 suse-pc kernel: [   9976.488826] ata1.00: cmd 60/08:00:50:8d:75/00:00:39:00:00/40 tag 0 ncq   4096 in  
2014-03-01T02:13:26.879428+02:00 suse-pc kernel: [   9976.488826]          res 41/40:08:51:8d:75/00:00:39:00:00/00 Emask   0x409 (media error) <F>
2014-03-01T02:13:26.879434+02:00 suse-pc kernel: [ 9976.488832] ata1.00: status: { DRDY ERR }  
2014-03-01T02:13:26.879437+02:00 suse-pc kernel: [ 9976.488836] ata1.00: error: { UNC }  
2014-03-01T02:13:26.948294+02:00 suse-pc kernel: [ 9976.557999] ata1.00: configured for UDMA/133  
2014-03-01T02:13:26.948313+02:00 suse-pc kernel: [ 9976.558034] sd 0:0:0:0: [sda] Unhandled sense code  
2014-03-01T02:13:26.948315+02:00 suse-pc kernel: [ 9976.558040] sd 0:0:0:0: [sda]    
2014-03-01T02:13:26.948316+02:00 suse-pc kernel: [ 9976.558044] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE  
2014-03-01T02:13:26.948317+02:00 suse-pc kernel: [ 9976.558048] sd 0:0:0:0: [sda]    
2014-03-01T02:13:26.948318+02:00 suse-pc kernel: [ 9976.558052] Sense Key : Medium Error [current] [descriptor]  
2014-03-01T02:13:26.948320+02:00 suse-pc kernel: [ 9976.558059] Descriptor sense data with sense descriptors (in hex):  
2014-03-01T02:13:26.948321+02:00 suse-pc kernel: [ 9976.558062]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00  
2014-03-01T02:13:26.948321+02:00 suse-pc kernel: [ 9976.558081]         39 75 8d 51  
2014-03-01T02:13:26.948335+02:00 suse-pc kernel: [ 9976.558090] sd 0:0:0:0: [sda]    
2014-03-01T02:13:26.948338+02:00 suse-pc kernel: [ 9976.558095] Add. Sense: Unrecovered read error - auto reallocate failed  
2014-03-01T02:13:26.948339+02:00 suse-pc kernel: [ 9976.558099] sd 0:0:0:0: [sda] CDB:  
2014-03-01T02:13:26.948340+02:00 suse-pc kernel: [ 9976.558102] Read(10): 28 00 39 75 8d 50 00 00 08 00  
2014-03-01T02:13:26.948341+02:00 suse-pc kernel: [ 9976.558119] end_request: I/O error, dev sda, sector 964005201  
2014-03-01T02:13:26.948342+02:00 suse-pc kernel: [ 9976.558207] ata1: EH complete  
    Any ideas ?     How can I fix it ?    Regards,  George 

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