Seagate BarraCuda 4TB 3.5-Inch Hard Drive (ST4000DM005): specs and uses

The Seagate BarraCuda 4TB (model ST4000DM005) is an internal 3.5-inch hard drive for general-purpose storage. It suits adding capacity to a desktop or all-in-one PC, holding games, music and films, or serving as a disk in a simple home server. Seagate says the BarraCuda family spans about 20 years.

What the headline specs mean

The drive spins at 7200 RPM, the faster of the usual speeds for 3.5-inch disks. Higher rotation speed generally means the heads reach data sooner, so it feels brisker than a 5400 RPM drive for everyday file access. It has a 256 MB cache, a small memory buffer that smooths out short bursts of reads and writes.

The connection is SATA 6Gb/s, the standard interface on desktop motherboards. Seagate says it is tuned for burst performance. A hard drive is much slower than an SSD at random access, so it is best treated as storage for large files rather than as a system drive.

Where Seagate says it fits

The brand's best-fit applications are desktop or all-in-one PCs, home servers and entry-level direct-attached storage (DAS), meaning drives connected directly to one computer rather than shared over a network. It describes this model as an upgrade for laptop or desktop computers, but the 3.5-inch size is a desktop format, so check that your machine has a bay for it.

Seagate's range also includes 2.5-inch drives, but this listing is for the 3.5-inch version.

Security features

The listing mentions Instant Secure Erase, which Seagate describes as an easy way to retire a drive safely by changing the encryption key so the old data is unreadable. It also mentions Seagate Secure models with hardware-based data security and Self-Encrypting Drive (SED) versions. These features belong to certain models in the family, so check the exact part number to see what yours includes.

Size and warranty

The drive measures about 5.8 x 4.0 x 0.8 inches (roughly 14.7 x 10.2 x 2 cm) and weighs 0.9 lb (around 0.4 kg). The warranty is a two-year limited manufacturer warranty.

Who it suits

It is a sensible fit for someone who needs lots of room for media, backups and game libraries in a desktop PC, and who is fine with hard drive speeds. For always-on, multi-drive NAS systems, manufacturers usually make dedicated NAS drives with extra firmware features, so read the maker's guidance if that's your plan.

What to check before you buy

• Make sure your computer has a free 3.5-inch bay, a spare SATA data port and a SATA power connector.
• Confirm your system or operating system supports a 4TB drive. Modern systems usually do, but older ones may need a particular partition style.
• Think about noise and vibration. A 7200 RPM drive may be audible in a quiet room.
• Decide how you'll back up the drive, since any single disk can fail.
• Check which model variant you are getting if encryption features matter to you.

The short version

• 4TB, 3.5-inch internal hard drive, 7200 RPM, SATA 6Gb/s, 256MB cache.
• Seagate points to desktops, all-in-ones, home servers and entry-level DAS.
• Features such as Instant Secure Erase apply to certain models in the family.
• Two-year limited warranty.
• Needs a free 3.5-inch bay and SATA connections.

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