The Dell TX8WW is a 4TB SAS 3.5" LFF Hard Drive. Increase the storage capacity of your system with the 4TB Hard Drive from Dell. Offering a rotational speed of 7.2K RPM, this drive provides fast disk access and ensures excellent performance. Featuring a Nearline SAS interface, the Dell TX8WW hard drive delivers data transfer speeds of up to 12Gbps.  Its high capacity and exceptional $/GB for capacity-optimized applications make it a great option for many Dell PowerEdge and PowerVault Systems. 
Near Line SAS are enterprise SATA drives with a SAS interface, head, media, and rotational speed of traditional enterprise-class SATA drives with the fully capable SAS interface typical for classic SAS drives. This provides better performance and reliability over SATA. Basically, it is a hybrid between SATA and SAS. 
The Dell TX8WW is a 7.2K Nearline SAS Capacity Optimized drive. It may provide much higher capacities, but reliability and performance are not as high when compared to Mission Critical drives. NL-SAS drives use the SAS interface, providing gains of up to 30% performance over traditional enterprise-class Serial ATA (SATA). NL-SAS drives, however, use a different media size to be able to offer greater overall capacity than SAS drives but are limited to a rotational speed of 7.2K RPM. The primary benefit of NL-SAS drives is the ability to have large-capacity drives while maintaining the faster speed of the SAS interface at an affordable price point. 
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Substitute PN:
 099RY, 0F9W8, 0KCVF5, 1MVTT, 25N64, 2FS207-150, 3FN93, 400-AEGH, 400-ALNY, 400-ALOV, 400-ALPN, 400-ALQD, 400-ALRT, 400-ALRV, 400-ASNK, 400-ATKL, 400-AUSS, 5JH5X, HNX0W, JPM7C, KCVF5, KRM6X,NT1X2, X4FKY, XWM1W, YXG4K 
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