CLK release today an update of his xbox360’s HDD/USB device explorer called Party Buffalo, now in version 2.0.1.0. This new version should fix a bug related to the disk size choice …

Here was the problem, which also applied to Party Buffalo: I was using the raw disk size, and not the actual size that the Xbox uses from the security sector. So, for some disks, the size of the file allocation table would be off by +- (around)0×3000, give or take, which would then make the data region off the Data partition off by that amount as well, therefore giving the user bad (just random) filenames and other weird stuff happening.

You can find the source code of this application on Google Code
You can visit the dev blog here

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