I plan on storing a large amount of photos, as well as OTA DVR'd material.
NTFS ALLOCATION UNIT SIZE WINDOWS
I mentioned my scenario (of 4K's) as an example to the OP, to let Windows choose the right AU size for a volume, unless you have a specific requirements if otherwise. So I just bought a new WD 1.5 TB 32mg cache caviar green hard drive and wondering what the best allocation unit size would be. I clarified this on my post, (Refer to the bold text), that is, the AU's you choose is abstract/has no bearing from how Dedup operates. The file will be saved on different clusters. 64 KB will need to be cached somewhere, usually. If you use more, such as 64KB, the issue is that the system will need to read the entire block before being able to write to it. If you use that cluster size, hence, it should be fine. If a cluster isn’t big enough to hold a file. NTFS default format has a default of 4096 bytes, but that cluster size only works for partitions of up to 16TB. If the size of the file is too small, the left space on the cluster can’t be used to contain other files. MS dedupe does not use chunks smaller then 32KB so your statement about relation with 4KB AUs on your volume has very little to zero sense :) See: Allocation unit size, also called as cluster size or block size, describes size of a single cluster, which is the smallest unit to save data. Once volumes are beyond a certain size, you'll have to use a set unit size. Unit size of a volume for the reasons to store particular file sizes on it for effecient use of space or as a performance benefit. I guess I'd only ever select a particular file allocation Which Microsoft considers the best general purpose size for typical users. For NTFS Windows drives that number is 4096 bytes. If you don’t have the time or opportunity to experiment, then you may as well just go with the default. This is because NTFS file compression is not possible on drives that have a larger cluster size. As for hard numbers, we can’t tell you which allocation unit size will work 100 for which purpose. By default, the maximum cluster size for NTFS under Windows NT 4.0 and later versions of Windows is 4 kilobytes (KB). If the drives going to be dedicated to a single version 11.0.1 SQL Anywhere database file, does it make sense for the allocation. Formatting a volume from Windows Explorer when the Allocation Unit box in the Format dialog box lists Default Allocation Size. I have 4K set on mine, that was automatically selected for my 1TB (931TiB) volume. When formatting a 931GB disk drive for NTFS on Windows Vista 64-bit, the default allocation unit size seems to be 4K, but other choices are available: 8K, 16K, 32K, 64K. IMO, the chuck sizes dedup operates upon are abstract from the file allocation unit size of a volume.
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