SATA HDD not seen in disk manager

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http://www.daniweb.com – I purchased a 1.5TB seagate drive about a month ago, this drive was placed in a USB caddie so that i could transfer data onto it from different sources before i fitted it to my computer. I have 2 other drives in the computer which are IDE, this drive i fitted into an internal SATA slot- (before it was fitted its drive letter assignement was removed) OS- XP with SP3 Bios sees the drive device manager sees the drive the small "safely remove hardware" icon comes up (not sure why?) Disk management doesnt see the drive, explorer doesnt see the drive.... Also the drive wasnt seen whilst it was still in the caddie when i connected it to the pc useing USB (General)