Corrupt Index Exception

[Hardika Catur S]

Hi,

I find this error when solr index. After this error appear, all 
collection cannot index to solr.

org.apache.lucene.index.CorruptIndexException: checksum failed (hardware 
problem?) : expected=7a1d93c3 actual=c44ec423 
(resource=BufferedChecksumIndexInput(RAMInputStream(name=_27zi.tvd)))

1. what caused the error appears??
2. how to solve this error??

Please help me to find a solution on.

Thanks,
Hardika CS.