I/O write () chunk 1

Hello Everyone, Can anyone tell me the cause/meaning of the following problem. I/O error 'read': expect 2048 actual -1 addr 0x16dc0 errno 5 retrys 0 I/O error 'read': expect 2048 actual -1 addr 0x16dc0 errno 5 retrys 1 I/O error, Primary Chunk '/dev/rootprime' -- offline I/O () chunk 1, pagenum 93632, pagecnt 1 --> errno =3D 5 INFORMIX-OnLine Must Abort Root chunk down. INFORMIX-OnLine entering ABORT mode!!! -- Online Aborting -- us=3Dc0011e60, pid=3D23437, uid=3D219 -- Online Aborting -- us=3Dc000c14c, pid=3D238, uid=3D0 I/O error 'write': expect 32768 actual -1 addr 0x24a1 errno 5 retrys 0 I/O error 'write': expect 32768 actual -1 addr 0x24a1 errno 5 retrys 1 I/O write () chunk 1, pagenum 9377, pagecnt 16 --> errno =3D 5 INFORMIX-OnLIne Must ABORT Root chunk down. -- Online Aborting -- us=3Dc000f960, pid=3D26172, uid=3D562 INFORMIX-OnLine Stopped This is the second time in the last 6 months that the primary chunk has gone down. Also any suggestions in preventing this problem is MUCH appreciated. Thx. Eve Croft.Evelyn@dorseylaw.com