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Silver 3.5 inch bare SATA hard drive with exposed circuit board

Seagate

Seagate ST3500641NS 500GB 7200 RPM 16MB SATA 3.0Gb/s 3.5" internal hard drive

SKU CH-SBG0-MA93X MPN ST3500641NS

A 500 GB, 7200 RPM desktop drive with 16 MB cache and SATA 3.0 Gb/s interface, built for 24×7 RAID server use

  • Total capacity500 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory16 MB
  • 500 GB capacity stores large datasets for server workloads
  • 7200 RPM spindle speed delivers fast sequential and random access
  • 16 MB cache buffers bursts to reduce latency
  • SATA 3.0 Gb/s interface integrates with existing server backplanes
  • RAID-friendly features and 24x7 reliability suit continuous operation

Seagate NL35 500GB SATA drive

The Seagate NL35 ST3500641NS is a 500GB 3.5-inch internal hard drive with a 7200 RPM spindle and 16MB cache. It connects via a SATA 3.0Gb/s interface and is designed for server and RAID deployments. The bare-drive packaging suits system integrators and IT departments building or expanding storage arrays. It is not for buyers who want a consumer desktop drive with retail accessories.

Sustained 24x7 RAID operation

RAID-friendly integration features increase system uptime, optimize performance and ease management in multi-drive configurations. Superior reliability enables operation in 24x7 RAID environments without the thermal throttling seen in desktop-class units. Average seek time of 8ms and average write time of 9ms remain consistent under continuous workloads. The drive leverages SAS compatibility with SATA for tiered storage systems tuned to capacity-intensive demands.

Bare-drive installation notes

The drive arrives as a bare unit without cables, brackets or mounting screws, so installers must supply their own SATA data and power cables. Standard 3.5-inch drive bays accept the form factor directly, but server chassis may require specific carrier trays. No software configuration is needed beyond BIOS or RAID controller recognition of the SATA 3.0Gb/s link. Missing mounting hardware is the most common reason an installation stalls.

How it compares

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

Price $110.99
Typical for this category: the median of 4,938 items is $107.99.
Total capacity 500 GB
Lower than about 80% of the 2,372 comparable items (median 2 TB).
Price per TB $221.98 per TB
Pricier than about 80% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineNL35
Model nameST3500641NS
Total capacity500 GB
Recommended useIdeal for Servers
Performance
Rotational speed7,200 RPM
Average seek time8 ms
Mean write time9 ms
Mean latency4.16 ms
Storage
Cache memory16 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.45 kg
Package size203 × 152 × 51 mm

Questions about this item

How much power and heat does the 7200 RPM ST3500641NS produce in a 24x7 server?

The 7200 RPM spindle and 16 MB cache are built for continuous operation; Seagate rates the NL35 series for 24x7 RAID environments, so power draw and heat stay within standard 3.5" SATA limits.

What host connector and bay size does the bare-drive ST3500641NS require?

It needs a standard SATA 3.0 Gb/s port and a 3.5" drive bay; the bare-drive packaging includes no cables, brackets or rails.

Will the SATA 3.0 Gb/s ST3500641NS work in an older SAS backplane?

Yes, the drive leverages SAS compatibility with SATA so it can be used in tiered storage systems alongside SAS controllers.

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