My computer: Intel Core 2 quad, 3GB RAM on ASUS P5P43TD Pro mobo OS: XP pro SP2 System32\drivers\atapi.sys\properties version 5.1.2600.2180 HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Atapi\Parameters\ EnableBigLba\0x00000001(1) I partitioned a Seagate 1.5 TB SATA harddrive into 100GB for OS/applications and the rest for data, both as NTFS. AdminTool/Computer Management\Storage\Disk Management shows two partitions of about 100GB and 1300GB, both Healthy, as expected. Harddisk Manager (Paragon) also shows the second partition being about 1400 GB and active, as expected. However: Window Explorer's Properties shows that the second partition is only about 800GB and almost no free space remaining. (I have used that much.) Why is Explorer indicating a reduced capacity? Where is the remaining about 600GB hiding? How can I make the whole partition avaiable? Appreciate help.