# Synology HAT3300-6T review: DSM compatibility, RAID rebuild time, who should skip it > Synology's 6TB 5,400 RPM NAS drive: RAID rebuild-time estimates, WD Red Plus comparison, and limits outside Synology NAS. Tags: synology, hat3300-6t, nas-hdd, 3-5-inch-hdd, sata, raid, 6tb Source: https://www.amazon.co.jp/dp/B0C2MKPR3G Article page: https://web-autoai.com/articles/nashddsynology-hat3300-6t-6tb-35-sata-5?lang=en Prices and ratings change over time — check the article page for the current values. --- ## Overview The Synology HAT3300-6T — 6TB NAS hard drive for 24/7 operation — is Synology's own 3.5-inch SATA hard drive for its NAS lineup. The short answer: **if you are putting it in a Synology NAS and managing it through DSM, it is the lowest-friction choice available. ** If you plan to use it in another brand's NAS or a desktop PC, most of the first-party advantage disappears. Key specs are 5,400 RPM, 256MB cache, a 202MB/s maximum transfer rate and 512e sectors. It is rated for an MTTF of 1 million hours and an annual workload of 180TB/year. Typical desktop drives are rated for roughly 55TB/year, so this drive is designed for about three times that amount of reading and writing. The drive belongs to Synology's Plus series. Its firmware can be updated directly from DSM (DiskStation Manager), and Synology has validated its compatibility. It puts stable 24/7 operation ahead of raw speed, which makes it a good fit for home and small-office NAS setups. ## Compatibility Guide The interface is SATA 6Gbps and the form factor is 3.5 inches. Any Synology NAS with 3.5-inch bays can take it directly. It will not fit 2.5-inch-only bays or trays, so check your NAS bay type first. As hardware, it is a standard SATA drive. It will be detected in other NAS brands, motherboard SATA ports and RAID cards. However, **DSM firmware updates and Synology's compatibility guarantee apply only inside a Synology NAS. ** The 180TB/year workload rating and the MTTF figure also assume use in a Synology system. You should also check your NAS model and DSM version. Synology tightened its handling of drives outside the compatibility list on some Plus models from 2025, and later DSM updates revised that policy. As a first-party drive, the HAT3300-6T is on the approved side. Still, **check Synology's official compatibility list for your exact model before buying. ** Older models may not list every first-party drive. The 512e sector format (4K physical sectors, presented as 512 bytes) is not an issue on modern operating systems or NAS units. It only matters if you reuse the drive with very old RAID cards or operating systems. | Check | This drive | Common pitfall | |---|---|---| | Form factor | 3.5-inch | Does not fit 2.5-inch-only bays | | Interface | SATA 6Gbps | Works physically in most NAS units and PCs | | Firmware updates | Via DSM | Limited update options outside Synology | | Compatibility guarantee | Synology NAS only | Check the per-model compatibility list | | Sector format | 512e | Verify with older RAID cards | ## Product Info Specs: 6TB, SATA 6Gbps, 5,400 RPM, 256MB cache, 202MB/s max transfer, 512e, 1,000,000-hour MTTF and 180TB/year workload. The warranty is 3 years. Only the bare drive is included, with no screws or cables. You use your NAS trays or PC hardware to mount it. Check the retailer's page for the latest price. HDD prices move a lot and have been especially volatile recently, so check the current price on the product page before you buy. Prices can differ widely between retailers, so it is worth comparing with Synology authorized resellers and major electronics stores. In the market, this is a first-party drive for Synology users. It usually costs more than third-party NAS drives of the same capacity. In return, you get DSM integration and validated compatibility. Whether that premium is worth it is the main question when deciding. ## Comparison with Competitors The usual alternatives are WD Red Plus and Seagate IronWolf. Both lines are mostly CMR NAS drives and have long been popular in Synology units. There are three main things to compare. - **Price**: First-party HAT3300 drives tend to cost more. The same budget often buys more capacity from another brand. - **Management**: The HAT3300-6T gets firmware updates via DSM and does not trigger compatibility warnings. Third-party drives have produced warnings on some models and DSM versions. - **Speed**: 5,400 RPM and 202MB/s is slower than 7,200 RPM-class drives for sequential transfers. Over gigabit Ethernet (about 110MB/s in practice) you will barely notice. On 10GbE, the difference can show. What you should avoid is putting desktop SMR (shingled magnetic recording) drives in a NAS RAID. SMR drives can slow down sharply during sustained writes and make RAID rebuilds take far longer. Some WD Red models (such as the 4TB WD40EFAX) and high-capacity WD Blue models use SMR. Check the recording method, not just the "NAS" label. If you want to be sure about the HAT3300-6T, check Synology's product specifications. ## RAID Layouts and Usable Capacity A 6TB drive shows up as about 5.46TiB in the OS. Drive makers count 1TB as 10^12 bytes, while operating systems count in powers of 2. It is not a fault. | Layout | Drives | Approx. usable capacity | Drive failures tolerated | |---|---|---|---| | RAID 1 / SHR | 2 | ~6TB | 1 | | RAID 5 / SHR | 4 | ~18TB | 1 | | RAID 6 / SHR-2 | 4 | ~12TB | 2 | You should also plan for rebuild time. Even at a steady 202MB/s, rebuilding 6TB takes a little over 8 hours on paper. In practice the NAS stays in use during the rebuild, so half a day to more than a full day is common. During that window, another drive failure can mean data loss. **RAID is not a substitute for backups. ** Keep another copy somewhere else. ## Installation Steps 1. Check Synology's website to confirm the HAT3300-6T is on your NAS model's compatibility list. 2. Power off the NAS (safest for a first install, even on hot-swap models), mount the drive in a tray and insert it. 3. Create a storage pool and volume in DSM Storage Manager. SHR makes it easier to add drives of different sizes later. 4. After setup, check the drive info in DSM for firmware updates and schedule regular S.M.A.R.T. tests. ## Best Use Cases - **Long-term Synology NAS owners** — DSM firmware updates and validated compatibility help keep the whole system stable. It is especially reassuring for photos, videos and other data you cannot replace. - **Small office or home server operators** — The 180TB/year workload rating handles several people reading and writing files. Avoid it for databases with heavy random I/O, since a 5,400 RPM drive is not suited to that. - **People building a Synology setup from scratch** — If you will not move the drive to other hardware, you get first-party support without complications. First-time NAS builders also save time choosing drives. ## Before You Buy **In another brand's NAS or a PC, the premium buys you almost nothing. ** The HAT3300-6T's strength is DSM integration and guaranteed compatibility, not drive speed. If you might use a QNAP NAS or a custom-built PC, WD Red Plus or Seagate IronWolf cost less and come in more capacities. **It is not built for speed. ** At 5,400 RPM and 202MB/s, it works well for file storage and backups. It falls short as a video-editing scratch disk, VM store or database drive. For those uses, add an SSD cache to the NAS or consider a 7,200 RPM-class drive. **6TB is hard to expand later. ** A two-bay RAID 1 gives you about 6TB of usable space. Photo and video libraries keep growing, and outgrowing the array means replacing drives one at a time and rebuilding. Buying more capacity up front can cost less overall. **For RAID, consider not buying every drive at the same time and place. ** Drives from the same production batch are said to fail around the same time. It is not mandatory, but splitting the purchase is one option. **Always check the price when you buy. Prices vary widely by retailer, so compare several stores. Amazon may also list several capacities on one page. Before adding it to your cart, check the image and title for "6TB" and "HAT3300-6T". ## FAQ **Q. Can I use it outside a Synology NAS? ** A. Physically, yes, since it is a SATA drive. Firmware updates and the compatibility guarantee only apply inside a Synology NAS. For other systems, third-party NAS drives are cheaper. **Q. Isn't 5,400 RPM too slow? ** A. For file sharing over gigabit Ethernet, the network is the bottleneck, so you will rarely notice. On 10GbE, or for VMs and databases, you will feel the difference. **Q. Why does it show about 5.4TB instead of 6TB? ** A. It is not a fault. The difference comes from how capacity is counted. **Q. How long is the warranty? ** A. 3 years. Keep your purchase records in case you need to make a claim. **Q. If I use RAID, do I still need backups? ** A. Yes. RAID protects against drive failure, not accidental deletion or ransomware. Keep a copy on another device or in the cloud. ### Product Disclosure (Amazon) - Manufacturer: Synology - Seller: XPRICE - Fulfilled by: XPRICE - ASIN: B0C2MKPR3G - Note: This article covers a manufacturer-made product based on Amazon listing details.