Western WD40EFRX Digital 4TB 6Gb/s SATA 5400 3.5-in 64MB Hard Drive

Key specifications

The figures below come from this listing's own record. They are the ones that decide whether a part drops into an existing system.

• Storage Capacity: 4 TB. Usable capacity as the manufacturer states it.
• Drive Interface: SATA. The bus the drive expects; the controller or backplane has to present the same one.
• Interface Standard: 6Gb/s SATA. The negotiated link standard.
• Maximum Data Transfer Rate: 6Gb/s. Peak link rate, which is not the same as sustained throughput.
• Drive Type: Internal. Where the drive is designed to sit.
• Drive Width: 3.5". Bay width, which decides whether it drops into the slot.
• RPM: 5400. Rotational speed recorded for this part.
• Cache Storage: 64MB. Onboard cache or buffer.

Confirming fit

Memory Clearance does not publish a verified compatibility list for WD40EFRX. Whether a part of this type is supported is defined by the system or switch vendor's own compatibility matrix, not by the part on its own.

The dependable check is the part number. Read the installed part number from the system's management interface and compare it with the number on this listing. If you send your server model with a quote request, it is checked against this part before you order.

Other Western Digital Server Hard Drives listings

Other parts in the same brand and category. These are not substitutes for this part number; check the specification before ordering.

• WD WUS721010AL5205 10TB 12Gb/s SAS 7200 3.5-inch 256MB Hard Drive
• Western Digital LBA39102336 20GB 5400RPM IDE/ATA-100 2MB Cache 3.5-Inch Hard Drive
• Western WD6000KHG Digital 600GB 6Gb/s SAS 10000 2.5-in 32MB Hard Drive
• WD HUS726T4TALS2yz 4TB 12Gb/s SAS 7200 3.5-inch 256MB Hard Drive
• WD WD200MFYYZ-01D45B0 2TB 6Gb/s SATA 7200 3.5-inch 64MB Hard Drive
• Western Digital WDAC2850-10F 853MB IDE Hard Drive
• WD HUS726T4TAL52yz 4TB 12Gb/s SAS 7200 3.5-inch 256MB Hard Drive
• WD WUH721414AL5205 14TB 12Gb/s SAS 7200 3.5-inch 512MB Hard Drive
• Western WD91FN Digital 9GB Ultra-320 SCSI 10000 3.5-inch 2MB Hard Drive
• Western WD10S12XJ Digital 1TB 6Gb/s SAS 5400 3.5-in Hard Drive

Common questions

Is WD40EFRX in stock?

Stock moves, so the quantity shown on this listing is the current figure. For a larger quantity, send the part number and how many you need and the answer comes back against that exact number. Quotes are answered weekdays 8:00 am to 5:00 pm PST.

Does this drive come with a tray?

Only if the listing name says so. Drive listings are either bare or supplied in a generation-matched hot-swap tray, and the name states which.

Can I use this to replace a failed array member?

Match the interface, the capacity, the sector format and the class of the drive already in the array. A mismatch on any of those can be rejected by the controller.

What do I send to get a price on WD40EFRX?

The part number, the quantity, the condition you will accept and the server model it goes into. That is enough to answer in one pass.

Guides

• Reading memory and drive specs
• Replacing a failed array drive
• Which drive tray fits your server
• Buying in volume