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тАО03-08-2002 10:55 AM
тАО03-08-2002 10:55 AM
number of read/write passes
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тАО03-09-2002 09:07 AM
тАО03-09-2002 09:07 AM
Re: number of read/write passes
Read/write passes is a measure how often the tape medium can be passed over the head before it wears out.
The total mb value reported by your software is the amount of data written to your tape by the software, which is a different measure.
Some software also keeps track of number of overwrites, showing how many times the tape has been written to from the beginning. However, since this does not count read operations, and number of times a tape was loaded until it was full (appended to), it does not translate to the total number of times the tape passed over the head.
In addition to this, if you drive does not stream (doesn't get the data fast enough from the host) it does what is sometimes referred to as shoe-shining (stopping, repositioning, restarting) which causes a lot of movement of the same porition over the head.
In general there is no way to find out how many times the tape passed over the head, and the value would differ for different portions of the tape in the same cartridge.
I wouldn't worry about this though, as 1 million passes is a lot of tape movement, and I have yet to see a cartridge that failed for exceeding this specification. It will fail for many different reasons long before than.
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тАО03-11-2002 07:18 AM
тАО03-11-2002 07:18 AM
Re: number of read/write passes
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тАО03-12-2002 02:57 AM
тАО03-12-2002 02:57 AM
Re: number of read/write passes
Try this document:
http://www.hp.com/cposupport/information_storage/support_doc/lpg50069.html
John
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тАО07-06-2010 11:32 AM
тАО07-06-2010 11:32 AM
Re: number of read/write passes
Hi, the link is broken, did you have a new reference?
I'm interested on this topic since I'm worried about know how long should I replace the tapes.
I'm using DAT 160 cartridges from HP, which have an MTBF of 2000 passes or 100 backups, but how can I know this number on every tape? Can't find any option on DPE 3.5 SP2
Or do you know if the DPE alerts me when is time to change the tape?
I had have alerts from the cleaning tape since the unit rejects to use it after several passes...but don't know what happens with media tapes.