4TB Western Digital Red PLUS WD40EFZZ, 3.5" NAS HDD, SATA III 6Gb/s, 5400rpm, 256MB Cache, OEM. MPN WD40EFZZ. Model WD40EFZZ. Western Digital 4TB Red Plus NAS 3.5" SATA HDD / Hard Drive 5400rpm. Western Digital partners with a wide range of NAS system vendors for extensive testing to ensure compatibility with most NAS enclosures.
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