Hi Scott,I think you may want to check the media statistics, like the soft write &hard write errors on that particular tapes.If the hard write are more than 2 & soft write are more than 100 , I willrecommend to replace the tape since you may have diffcult restoring the dataintegrity.cheersRakesh"John Considine" wrote:>>Hi Scott>We have been using up until this month a Compaq TL 895 robotic library with>DLT7000 drives we use DLT 4 tapes and only replace them once the media is>reported as bad this has proved to be up to 18 months, the drives are cleaned>daily and the backups run 7 days a week some people might say 12 monthsbut>if the media is ok to write to and read from then i dont believe there is>a rule. >>"Scott Adams" wrote:>>We use an ADIC FastStor2 with SDLT 320 tapes. Part of our rotation strategy>>is doing differentials Mon-Thurs. I will be using the same set of tapes>for>>my differentials, but I don't exactly know when I need to expire the media.>>What guidelines should I use? The manufacturer of my tapes says that the>>tapes are good for 1,000,000 head passes, but that doesn't mean anything>to>>me? Do I base it on drive hours, size of data written/read, # of mounts,>>hard errors? Thanks in advance for your suggestions.>>>>Scott>>>>>