sminlal :
Sorry, this is a little bit off topic but I'd like to prevent misleading information from spreading:
There's no difference in speed reading or writing files on volumes with 4K or 64K-byte allocation sizes. It's just as fast to read 1M of data from 256 4K clusters as it is to read is from 16 64K clusters. In both cases the work that's actually done is to read 2048 sectors of 512 byes each from the drive.
Where a larger allocation size helps is in reducing the amount of file system metadata needed to track files. And there can be an indirect speed benefit because if your volume gets badly fragmented then for a file of a given size the drive with the larger clusters will have fewer file segments to seek to. But that's an abnormal condition that should be avoided.
The downside of the larger cluster size is that every file will waste an average of half the cluster size of unused space in the last cluster, which is why large cluster sizes are generally recommended only for volumes that store large files.
You are contradicting yourself. First you say my information is fud, then you say it indirectly gives a speed benefit.
I did not give misleading information, it is fact that if you have a higher cluster size your transfer rates will go up slightly versus a smaller cluster size, it is not going to magically double your transfer speeds (if that is what you thought i was saying) though. It does create "wasted" space.
Yes a higher cluster size does waste disk space especially if you write lots of small files. But for larger files - it wouldn't really matter.
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Alright...did some more digging for you there swood. Not sure if this information will be helpful but here you go:
http://support.wdc.com/product/download.asp?wdc_lang=en&fid=wdsfMyPassport_Essential_SE
Try downloading a new firmware version to your HDD (im not sure if you already have it).
http://support.wdc.com/download/notes/Win_Univ_FW_Updater_31011_ReleaseNotes.pdf
Just make sure to back up the data first and read the instructions carefully.
I was thinking this firmware update could possibly fix your issue - as it mentions it "fixes some incompatibility issues with some HP USB products" since I noticed you have an HP notebook. I don't know what that means exactly - but maybe it's related to your issue (not getting your full speed)?