a little more info may get u some more help........ there r many reasons a partiton becomes invisible.....they can be made this way with a boot manager... or by an incorrect file structure .......EG......if ur running xp with a fat32 file system and created ntfs partitions this will cause what u r experiencing.... if so the only way i know to correct it is with system commander to make the lost partitions visible by converting them back to fat32......sumthin partition magic cant do is convert to older file structures..... with a boot manager if u have more than one O/S new partitions r normally hidden by default until u go into the settings for it and make all the partitions visible