The Dell 4J5P1 is a 600GB Serial Attached SCSI (SAS) 2.5" SFF Hard Drive. Increase the storage capacity of your system with the 600GB Hard Drive from Dell. Offering a rotational speed of 15K RPM, this drive provides fast disk access. Featuring a SAS interface, the Dell 4J5P1 hard drive delivers data transfer speeds of up to 6Gbps, making it a great option for many Dell PowerEdge Systems.   
SAS is the logical evolution of SCSI including its long-established software advantage and the serial physical connection interface. With enterprise storage requirements escalating and becoming more complex factors such as larger capacity greater density security scalability and accessibility are more critical than ever. Enterprise data centers must be online all the time fulfill requests from numerous users simultaneously allow for constant growth and expansion and be maintained while in operation. Serial Attached SCSI meets all these demands while providing the highest performance. 
The Performance Optimized drives (10K and 15K SAS) such as the Dell 4J5P1 are used in those applications requiring high reliability and performance and only available in 2.5" small form factor and only SAS interface. In general, 2.5" drives provide higher I/O density per rack space unit, over its larger counterpart. SAS drives use a serial-attached SCSI interface for connecting to the server which provides a full bandwidth connection to each drive. This point-to-point controller interface delivers a speed advantage compared to SATA drives, which share the same interface among all drives on the bus. Additionally, a second advantage for SAS drives is that they are available in faster rotational speeds (up to 15K RPM) than NL-SAS or SATA drives (up to 7.2K RPM) which gives the SAS drives up to 2 times better seek times.  
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