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WD40EZAZ, 4TB, 3,5", 5400RPM, SATAIII, 256MB Cache.
WD40PURX 4TB, 3,5", 5400RPM, SATAIII, 64MB Cache. The WD Purple drive is designed specifically for 24/7 DVR and NVR surveillance solutions and is optimized with AllFrame 4K™technology for system playback and performance. 3 year warranty.
WD4004FZWX 4TB, 3,5", 7200RPM, SATAIII, 128 MB Cache. 5 years warranty.
WD40EFRX 4TB, 3,5", IntelliPower™, SATA 3, 64MB Cache. The ideal and reliable drives for small systems NAS (Network Attached Storage) and RAID structure, designed for high temperature and 24/7 operation. With system IntelliPower™, calculates optimum spin speed (RPM), designed to deliver both significant power savings and solid performance. 3 years warranty.