On GPT partitioned hard drives partitions 'occationally' have the attribute 'no default drive letter' set. The volume should immediately get a drive letter assigned then. For instance if you want to remove the hidden attribute from volume 13: The attributes are shown in the right-most column. So, on a MBR disk with multiple partitions, if you set the hidden attribute to any volume they disappear all. So, when a GPT drive is turned into a MBR drive and the old GPT entries at LBA2 are not clensed then there is a 50:50 chance that the MBR partition is seen as hidden and/or read-only.įurthermore they did it all wrong: Even diskpart pretends to set the attributes per volume it reads and writes them all to the same place and so does Windows. But attributes are not in the usual place, instead they are written 32 bytes early, where the unique parition GUID belongs in a real GPT partition table. It is written into the third sector on disk (LBA2) as an rudimentrary "Basic Data" GPT partition entry. The MBR partition scheme does not have such attibutes but Microsoft fiddled in something similar: By means of the diskpart command-line tool even a MBR partition can get a hidden (and read-only) attribute. The GPT partition scheme knows a hidden attribute which prevents a partition being turned into an active storage volume. Volume has the 'hidden' or 'no default drive letter' attribute This page is available in German language too Troubleshooting for USB pen drives under Windows XP
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