You'll never suffer from fragmentation but you'll pay in terms of extra backup storage needed. If use a product like diskeeper which defrags the c:\ drive continueally 24x7 in the background then be preprared for daily 700meg incr files. If you buy into the concept that a defrag will be unattended/automated/and possibly off hours. So if your going to defragment then for gosh sakes do it off hours while your sleeping or otherwise away from the pc. If you ever do a defrag, and you sitting there watching it/waiting for it to finish then you are by definition maximizing the negative performance impact of fragmentation of your disk. You don't want the cure to be worse then the disease. Probably before reached this point in terms of fragmentation, your backup disk will be at the end of its useful life and you could just copy the whole disk of the tibs to a new disk. A tib in that many fragments would need to be on a very fragmented disk and be very large and probably talke about 30-90 mintues to restore in any event, so what's 15 seconds on an hour long task in exchange for the hours one might have spent before that on repeated defragging to avoids frags on the disk?Įven if you harddisk over years of use became just impossibly fragmented beyond belief, it'd be easier to just copy off some select tibs for history's sake and then delete and start over. Suppose your average access time is 9 ms and your backup file 100GB and is in an incredible 3,200 fragments - after going through all the math, allowing for latency and such, this means restoring this file will take about 15 seconds longer than it would if it weren't fragmented at all. If you look at the average access time for your harddisk, that's roughly the amount of time that's added when you have go from one fragment of a file to another. The benefits of defragging are terribly overrated, especially by defragger vendors. Once when created and then never again except on those rare ocassions when you actually use it for a restore. Tibs are files that are usually used, on average, much less than twice. Absolutely correct, almost - the question then would be, why defrag at all if there are nothing but tibs on the disk. If all he has on the disk are tibs, then defragging will put a lot of wear and tear on the drive with vrtually no appreciable benefit when backing up or restoring.
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