BTW, defragging an external HDD will take a long time because of the slow USB interface that is much slower than the internal IDE/SATA standard, so expect long defrag times.
DISKKEEPER 2.0 STATIC PROBLEM PRO
That said, I use Diskeeper 2009 Pro on my XP machines, and it's always left on auto defrag (defrags only in the background using idle cycles) so defrag times are not an issue for me. So predicting defrag times is a hit or miss affair. and very importantly, the defraggers algorithms.
disk activity from other applications -CPU usage -fragmented free space -available free space.
system files like the page file (and MFT for most defraggers) cannot be moved online, and they also form barriers to other file movements. Some of the variables are -speed of the drive itself -volume of fragmented files -size of the fragmented files (moving larger files obviously takes longer) -type of fragmented files. Yes, defrag times are highly unpredictable. So ensure that the drive is running cool and stable, to get some decent life out of it. Drives die either due to construction/QC problems (early failure) or due to poor environmental conditions like dust, heat, vibration, shock etc. The platters are always spinning, and something is always going on in the background.indexing, superfetch, pagefile, log files etc etc., yet drives don't die because of this. Remember, the drive is always working as soon as the system is turned on. Ofcourse, I have added temporary file directories such as my Opera browser cache to the file exclusion list since there is no point defragging those so Diskeeper ignores those. Hardly any stress on the drive, and it reduces the number of seeks for reading the same file (compared to the fragmented state). I too use Diskeeper 2009 auto defrag, and it doesn't defrag every single time the system is idle, only if it's necessary i.e. A defragmented file will not fragment unless it's modified and cannot expand contiguously. As for defrag, once the files are defragged, then there is no 'too much defrag' since there is nothing to defrag, so there is no wear & tear on the drive.
DISKKEEPER 2.0 STATIC PROBLEM SOFTWARE
No software can change this, to the best of my knowledge. The magnetization of the grain (corresponding to the 'bit') is a materials property and the fields strengths required for that are carefully calibrated by the drive manufacturer and precisely applied by the read/write head. If any program claims to be able to 'refresh' the 'grains' (collection of magnetic domains) of the magnetic thin film coating of the platter, then it's a false claim.
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