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3.5 inch silver metal internal hard drive with circuit board visible on bottom

Synology Inc.

Synology Inc. HAS5300-12T 12TB 7200 RPM 256MB SAS 12Gb/s 3.5" internal hard drive

SKU CH-5TKR-D77K3 MPN HAS5300-12T

Enterprise SAS hard drive delivering 12 TB at 7200 RPM with 256 MB cache, rated 2.5M-hour MTTF and up to 281 MB/s transfer for Synology NAS

  • InterfaceSAS 12Gb/s
  • Capacity12TB
  • RPM7200 RPM
  • Cache256MB
  • UsageFor NAS systems
  • Form Factor3.5"
  • 12 TB capacity for large NAS volumes
  • 7200 RPM and 256 MB cache deliver up to 281 MB/s sustained transfer
  • SAS 12Gb/s interface for low-latency enterprise workloads
  • 5 M-hour MTTF and 200 000 hours tested on Synology hardware
  • Up to 27 % faster RAID repair with DSM-optimised firmware

Enterprise SAS Drive for Synology NAS

The Synology HAS5300-12T is a 12TB enterprise-grade hard drive built for Synology NAS systems. Its SAS 12Gb/s interface and 7200 RPM spindle speed target environments that demand consistent throughput and tight firmware integration. The 3.5-inch form factor fits standard drive bays in rackmount and tower chassis. Buyers needing non-SAS interfaces or non-Synology firmware optimisation should look elsewhere.

12TB Capacity with 256MB Cache Headroom

The drive provides 12TB of raw storage and a 256MB cache to absorb burst workloads and metadata operations. Sustained sequential transfers reach up to 281 MB/s, so large-volume backups and media ingest stay fast until the mechanical media limit is reached. Random I/O latency and rebuild times will become the bottleneck before the cache saturates. Workloads requiring significantly higher IOPS or sub-millisecond latency exceed what this spinning-media design can deliver.

SAS 12Gb/s Interface Practical Limits

The SAS 12Gb/s link offers ample bandwidth for the drive’s 281 MB/s sustained rate, leaving headroom for command overhead and multi-drive arrays. Firmware updates apply with one click through DSM, and the drive is rated for 2.5 million hours MTTF after 200,000 hours of Synology validation testing. Repair of degraded RAID arrays runs up to 27% faster than similar-class drives on the same platform. Systems without SAS backplanes or DSM management cannot use this drive.

Punti di forza

  • 12 TB capacity for large NAS volumes
  • 7200 RPM and 256 MB cache deliver up to 281 MB/s sustained transfer
  • SAS 12Gb/s interface for low-latency enterprise workloads
  • 5 M-hour MTTF and 200 000 hours tested on Synology hardware
  • Up to 27 % faster RAID repair with DSM-optimised firmware

Caratteristiche tecniche

BrandSynology
ModelHAS5300-12T
InterfaceSAS 12Gb/s
Capacity12TB
RPM7200 RPM
Cache256MB
UsageFor NAS systems
Form Factor3.5"
Peso di spedizione0.79 kg
Dimensioni del pacco178 × 140 × 51 mm

Domande su questo articolo

Will the 12Gb/s SAS interface work with my existing 6Gb/s SAS backplane?

The drive uses a 12Gb/s SAS interface which is backwards compatible with 6Gb/s SAS backplanes; it will operate at the lower 6Gb/s speed when connected to older hardware.

How can I verify the drive is delivering the rated 281 MB/s sustained transfer after installation?

Monitor sustained read/write speeds in DSM storage manager during large sequential transfers; the drive is rated for up to 281 MB/s sustained data transfer in Synology systems.

Does the retail box include mounting screws or a SAS cable, or must I buy them separately?

The drive ships in retail or OEM packing that may vary; mounting screws and SAS cables are typically supplied with the Synology NAS chassis or drive tray, not the bare drive.

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