[CentOS] kernel errors

For monday this week I began to receive these advice by email from the server; 
Wht's the meaning?

Disk read problem or else?



 --------------------- Kernel Begin ------------------------ 

WARNING:  Kernel Errors Present
    I/O error: dev 08:02, sect...:  4Time(s)
   Additional sense indicates Unrecovered read error...:  4Time(s)
   Info fld=0x4f9c9, Current sd08:02: sense key Medium Error...:  1Time(s)
   Info fld=0x50e37, Current sd08:02: sense key Medium Error...:  1Time(s)
   Info fld=0x517a1, Current sd08:02: sense key Medium Error...:  1Time(s)
   Info fld=0x517e2, Current sd08:02: sense key Medium Error...:  1Time(s)
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Michel Donais
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