最近毎日おきてるエラー

init_special_inode: bogus i_mode (764)
init_special_inode: bogus i_mode (764)
init_special_inode: bogus i_mode (764)
init_special_inode: bogus i_mode (764)
EXT3-fs error (device hda7): ext3_readdir: bad entry in directory #98585890: rec_len % 4 != 0 - offset=892, inode=98585941, rec_len=262, name_len=112
Aborting journal on device hda7.
ext3_abort called.
EXT3-fs abort (device hda7): ext3_journal_start: Detected aborted journal
Remounting filesystem read-only
init_special_inode: bogus i_mode (777)
init_special_inode: bogus i_mode (777)
init_special_inode: bogus i_mode (0)
init_special_inode: bogus i_mode (0)
init_special_inode: bogus i_mode (2122)

最近毎日このエラーでファイルシステムがおかしくなってます.まいにち fsck かけてます.RAID-5なのに,なんで?? とりあえず,物理的なディスクには障害はでてないのだけど….