NAS hard drives / Comparison

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New internal 3.5-inch SATA hard drives for US NAS buyers. Enclosures, SSD cache and tested interoperability are separate buying tasks.

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Documented specifications and exact purchase packages
Compare the details	Plus Series HAT3320-8T (8 TB) (US single drive)
Community reviews	No community reviews yet. Purchase packages of the same model share one community score. Read all reviews Write a review
US purchase package	HAT3320-8T, 8 TB, new single internal drive; not recertified, used, a multi-pack or a NAS enclosure. Product & sources Select the exact part number and capacity. A different suffix, condition or seller can change the hardware and warranty scope. No enclosure, drive-pair compatibility result, current price or available-stock claim is included. Confirm any cables or mounting accessories with the seller. Sources · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.CDW: US seller listing: Synology HAT3320-8TChecked 2026-10-21. Read the original source and its check date before relying on this value.
Where to buy	Select: HAT3320-8T, 8 TB, new single internal drive; not recertified, used, a multi-pack or a NAS enclosure. View at CDW — Plus Series HAT3320-8T (8 TB) (US single drive); opens in a new tab The link may open several packages. Check current price and availability with the seller. Opens in a new tab.
Nominal capacity Manufacturer capacity of the exact drive model. Formatting, storage layout and system overhead reduce usable capacity; a mirror does not add both drive capacities.	8 TB Sources · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.Synology: Plus Series 3.5-inch SATA HDD: US product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Physical format and interface Documented drive size and connection family. Check the NAS bay and interface. SATA hardware alone does not establish an approved drive and firmware pairing.	3.5-inch SATA Sources · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.Synology: Plus Series 3.5-inch SATA HDD: US product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Recording method The recording method explicitly stated for this part number. CMR is a recording technology, not a measured reliability score or a NAS compatibility certificate.	CMRSynology states CMR for the whole Plus Series; the 8 TB column does not repeat it. Sources · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.Synology: Plus Series 3.5-inch SATA HDD: US product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Spindle speed Manufacturer-reported rotational speed for the exact capacity and model. Do not transfer a speed from another capacity in the same family or use RPM alone to predict noise or application performance.	7200 rpm Sources · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.Synology: Plus Series 3.5-inch SATA HDD: US product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Drive cache Cache capacity listed for the exact model. Cache size does not measure sustained file-transfer speed; similarly named drives may use different cache capacities.	512 MB Source · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.
Rated annual workload The manufacturer annual workload rating, not a lifetime write allowance. Keep the source definition and operating conditions. A higher rating does not guarantee a longer life or replace a backup.	300 TB/yearExact-model datasheet value. The same datasheet's series highlights and the US page also state 180 TB/year for the Plus Series. Source · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.
Limited warranty term Published manufacturer limited-warranty duration for the reviewed new-drive scope. Check seller, condition, region and serial-number eligibility; used, refurbished and OEM offers can have different coverage.	3 yearsLimited warranty from the purchase date on the receipt; verify the eligibility of the delivered new-drive serial number and seller. Sources · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.Synology: Plus Series 3.5-inch SATA HDD: US product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Published maximum transfer rate A source-specific maximum sequential or sustained transfer figure. Manufacturer methods differ. This is not a CompareFoundry benchmark, network rate or guaranteed speed throughout the disk.	281 MB/sManufacturer typical sustained maximum for this exact part; not a measured NAS or network result. Sources · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.Synology: Plus Series 3.5-inch SATA HDD: US product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Drive weight The published weight of the drive, not its shipping package. Use the NAS installation instructions; a weight figure does not describe operating clearance, vibration or supplied mounting hardware.	755 g Source · 2026-10-21 Synology: Plus Series 3.5-inch SATA HDD datasheet: HAT3320-8T columnChecked 2026-10-21. Read the original source and its check date before relying on this value.
Verified NAS and firmware pairing An exact enclosure, drive and firmware compatibility result, when separately established. An unknown entry means this catalogue has not established the pairing. It does not mean that the drive is incompatible.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. No exact NAS model, operating-system version and drive-firmware pairing was established in this category review.
Questions to check before buying	Synology's US store showed a maintenance notice on the check date; the CDW listing is a reseller route whose authorization was not verified. Synology delivers firmware for these drives through DSM, but this catalogue has not established a pairing with an exact NAS model and DSM version.

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