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Oracle ASM unable to find ASM disk header in some disks

Oracle ASM unable to find ASM disk header in some disks

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 ASM unable to find ASM disk header in some disks.These headers (at least 
  5MB+) is zero filled in each disk (mpath218p1, mpath217). 
 
  I tried to see if disk start, end is relocated and these header can be found 
  in different offset of the same disk. But, it doesn't seem so. These data is  not relocated. They are corrupted. 
 
  It is not issue at ASM/RDBMS level. 
 
 FURTHER PLANS: 
 ================================================================ 
 -ASM/RDBMS doesn't do zero fill. It is not issue at ASM/RDBMS level. 
  Given that 5mb+ is corrupted, it should have caused external to ORACLE. 
 
 
 -Please ask ct to check for following 
  -any manual error. someone inadvertently does dd if=/dev/zero' on these 
   disks 
  -any tools, scripts, 3rd party tools that might do such writes. If 
   there is no known applications/tool, please suggest ct to run some 
   monitoring tools that does write on the disks (something like fuser command 
 
   should help to list pid that have opened the disks.) 
  -Given that corruption occurred in same storage (ETL420), it might be 
   issue at storage level. please involve storage support to see if something 
   wrong at storage level.