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Silver 3.5 inch internal hard drive with circuit board visible on underside

Toshiba

Toshiba N300 Pro HDWG51JXZSTB 18TB 7200 RPM 512MB Cache 3.5" SATA internal hard drive

SKU CH-R7KN-A33W8 MPN HDWG51JXZSTB

An 18 TB 3.5-inch CMR drive with 7200 RPM and 512 MB cache, rated for 300 TB/yr workloads and up to 24-bay NAS arrays

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory512 MB

Capacity 18TB

  • Enterprise NAS reliability with 300 TB/yr workload rating
  • 18 TB capacity for up to 24 drive bays
  • 7200 RPM and 512 MB cache for fast access
  • CMR technology ensures consistent performance
  • Built-in RV sensors reduce vibration in RAID arrays

Enterprise NAS storage for multi-bay systems

The Toshiba N300 Pro HDWG51JXZSTB is an 18TB 3.5-inch internal hard drive built for business network-attached storage. It supports enclosures with up to 24 drive bays and handles workloads of 300 TB per year. The drive uses CMR recording technology and spins at 7200 RPM with a 512MB cache for consistent throughput.

Thermals and vibration control for 24/7 operation

Engineered for continuous operation, the drive functions across wide temperature ranges. Built-in rotational vibration sensors counteract vibration in multi-RAID environments, helping maintain stable performance when many drives run side by side. The SATA 6.0Gb/s interface delivers standard power draw for this class of enterprise drive.

Standard 3.5-inch form factor

Dimensions are 147.00mm long, 101.85mm wide and 26.10mm high, fitting regular 3.5-inch drive trays. A single SATA data and power connector provides broad compatibility with NAS chassis and RAID controllers. Packaging may vary between retail and OEM, but the drive itself is identical. Not suited for buyers who need smaller 2.5-inch drives or non-RAID desktop workloads.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $369.99
Pricier than about 88% of the 4,938 comparable items (median $107.99).
Total capacity 18 TB
Higher than about 93% of the 2,372 comparable items (median 2 TB).
Price per TB $20.56 per TB
Cheaper than about 92% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameTOSHIBA
Product lineN300 Pro
Model nameHDWG51JXZSTB
Total capacity18 TB
Recommended useEnterprise NAS Hard Drives
Performance
Rotational speed7,200 RPM
Storage
Recording methodCMR
Cache memory512 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.85 mm
Maximum length147 mm
Shipping weight0.77 kg
Package size192 × 140 × 62 mm

Other versions of this model

1 more in the same range

Questions about this item

How do I install the 3.5" SATA drive in a 24-bay NAS and what step is often missed?

Mount the drive using the 26.10 mm height, 101.85 mm width and 147.00 mm length dimensions, connect SATA 6.0Gb/s data and power cables, then enable the built-in RV sensors in the NAS firmware so rotational-vibration compensation activates in multi-drive arrays.

What maintenance or replacement will the 18 TB CMR drive need over its service life?

The drive is rated for a 300 TB per year workload and 24/7 operation; plan to replace it once cumulative writes approach that annualised limit or when SMART attributes indicate reallocated-sector growth.

What limit appears first during sustained 7200 RPM writes on this 512 MB cache drive?

The 300 TB per year workload rating is the first ceiling you will hit under continuous heavy writes before thermal or mechanical constraints become binding.

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