Ide hard drive capacity problem in Solaris

IDE interface hard disk 160G, the PC can recognize , but then in sunblade150 machine, install solaris8 time , how to get all the available space is only 500m , how big God how to deal with ? ( With a variety of trays pc machine tools , primary partition, set active sector Dounong )
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use the dd command , pay attention to the specified length , just before the fifteen sector can be covered