Synology HAT3300: Which Plus Series Part Number Is Which Capacity, 4TB to 20TB

Synology HAT3300 prices on Amazon.co.uk

This table lists Synology Plus Series offers on Amazon.co.uk whose titles carry a HAT33 number, sorted by pounds per TB inc VAT. New and used share it, so check the Condition column. The table shows 7 listings right now. The lowest figure per TB is £38.75/TB and the lowest outlay is £218.97, often on a smaller drive.

Listings do not always use Synology's own model names. A listing may print HAT3310-8T or HAT3300-20T; neither is on Synology's sheet, whose 8 TB and 20 TB models are HAT3320-8T and HAT3320-20T. Ask the seller for the exact model on the drive label before you buy.

Synology states CMR for the whole Plus Series, and its UK product page says the series uses 100% conventional magnetic recording. The Recording column prints a technology only where a document names a row's own part number, so it may stay empty on these rows; an empty cell means unmatched, not SMR.

Synology HAT3300 part numbers: HAT3300-4T to HAT3320-20T

Synology's 2026 Plus Series data sheet, PLUSHDD3320-2026-ENU-REV000, lists six capacities under three model prefixes:

• 4 TB: HAT3300-4T
• 6 TB: HAT3300-6T
• 8 TB: HAT3320-8T
• 12 TB: HAT3310-12T
• 16 TB: HAT3310-16T
• 20 TB: HAT3320-20T

The prefix does not follow capacity in a straight line, so searching for one prefix misses drives. A search for Synology HAT3300-8T or HAT3300-12T will not find those exact models on the sheet: its 8 TB drive is HAT3320-8T and its 12 TB drive is HAT3310-12T. The Synology HAT3300-4T and HAT3300-6T are the only two models on the sheet that carry the HAT3300 prefix itself.

We have not found a Synology document that lists a HAT3300-2T. The 2026 Plus Series sheet starts at 4 TB, and Synology's UK product page carries no capacity table. If you see a 2 TB drive offered under that name, ask the seller which Synology document describes it.

Synology HAT3300 4TB and 6TB: air-filled, 5,400 RPM

The two smallest models share their speed, cache and MTBF. They differ in noise and idle power.

The Synology HAT3300 4TB is the quietest air-filled model on the sheet at idle, 4 dB below the 6 TB, while the 6 TB draws less power at idle, 3.40 W against 3.96 W. Both carry the lowest MTBF in the series, 1,000,000 hours against 1,200,000 for the larger models, and the slowest sustained rate.

Synology HAT3300 8TB against the 12TB and 16TB

The Synology HAT3300 8TB slot is filled by HAT3320-8T, and it is the odd one out: air-filled like the small drives but spinning at 7,200 RPM like the large ones. That combination makes it the loudest model on the sheet and the hungriest at idle.

On paper the 12 TB matches the 8 TB on speed, cache and MTBF, is 14 dB quieter at idle and draws 2.44 W less. If the NAS sits in a room people use, that is a strong reason to skip 8 TB and buy 12 TB; the 12 TB also has the lowest idle power of the six. The 20 TB HAT3320-20T is helium-sealed at 7,200 RPM too, with the largest cache in the series at 1 GB, the highest sustained rate at 295 MB/s, 1,200,000 hours MTBF, 4.35 W idle, and the same 20 dB idle and 32 dB seek as the 12 and 16 TB.

Synology HAT3300 workload rating: two figures from Synology

Synology gives two workload figures for the Plus Series, and we print both rather than choose. Its UK product page says in its text that Plus Series drives have a workload rating of 180 TB per year, while its specification list shows 300 TB per year. The 2026 data sheet does the same: its prose and highlights box say 180 TB a year, and its specification table gives 180 TB a year for most models and 300 TB a year in the HAT3320-8T column.

If your NAS writes heavily, ask Synology or the seller which figure applies to the exact model you are buying before you rely on either.

Synology HAT3300 against HAT5300 and a 12TB enterprise drive

Synology sells its own step up. Its HAT5300 Enterprise Series sheet rates every model at 550 TB transferred per year and gives a 5-year warranty, against the Plus Series' 3-year limited warranty. Outside Synology's range, Toshiba's MG09 overview lists a 12 TB SATA model, MG09ACA12T, and rates the series at 550 TB a year, and Seagate gives Exos X24 a 5-year limited warranty and 2.5 million hours MTBF.

The table below holds new SATA drives from the Exos, Ultrastar and Toshiba MG lines at exactly 12 TB, the size of HAT3310-12T. A row's rating belongs to its own maker's sheet, so read each part number before applying a figure above. It holds 4 listings right now. Lowest per TB in it: £26.26/TB.

Whichever drive you choose for a Synology NAS, check Synology's compatibility list for your exact NAS model and the exact drive part number before you buy; we make no compatibility claim on this page. The Synology HAT5300 page covers the Enterprise Series.

Planning a HAT3300 array

Usable space depends on the RAID level as much as the drive size. Run your bay count and the capacity you are weighing through the calculator before choosing between, say, four 12 TB drives and three 16 TB drives.