Updated 3 hours ago · Specifications verified September 1, 2026

Build a Reliable Eight-Drive DS1825neo+ Array

New SATA CMR drives ranked by live value, with full eight-bay cost examples

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Quick answer

For an eight-bay DS1825neo+, buy a matched set of new CMR drives and judge the complete array rather than one cheap disk. Mainstream IronWolf, WD Red Plus and Toshiba N300 suit quieter general storage; Pro and enterprise SATA families suit sustained workloads and high capacities when their extra noise and power are acceptable.

As of September 12, 2026

Best price per TB

$26.11

Products tracked

Prices updated

3 hours ago

Pre-filled for the Synology DS1825neo+: 8 bays, up to 24TB per bay.

RAID levelNumber of drivesSize per drive (TB)

Common sizes

Mixed drive sizes (SHR reclaims the surplus)

Usable capacity

50.93 TB

Raw total

64.00 TB

Protection overhead

8.00 TB

Fault tolerance

1 drive

Live drive cost

$1671

Usable price per TB

$32.81

With 8x 8TB in Synology SHR you get about 50.93 TB usable and 1-drive fault tolerance. At the cheapest live NAS price per terabyte ($26.11/TB), filling these bays costs about $1671.

Usable capacity is shown after binary and filesystem overhead (about 9%). Fault tolerance is not a backup; keep a separate copy of important data.

Live new SATA CMR drives for the DS1825neo+, sorted by $/TB

Price per

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60 products

Product	Capacity	Price	$ / TB	Type	Prime	Buy
Western Digital Internal Hard Drives 18Tb DC HC550 Surveillance,Wd 3.5 HDD Sata 6Gb/s 7200 PRM NAS 512 mb Cache for Dvr Nvr	18 TB	$469.99	$26.11	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
HGST Ultrastar He12 \| HUH721212ALE601 \| 0F27454 \| 12TB 7200 RPM 256MB SATA 6.0Gb/s 3.5" Cache \| 512E \| BitLocker Hard Drive Encryption \| Power Disable Function \|	12 TB	$329.99	$27.50	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital HUH721212ALE604 12TB Ultrastar DC HC520 SATA HDD - 7200 RPM Class, SATA 6 Gb/s, 256MB Cache, 3.5"	12 TB	$349.00	$29.08	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
WD Ultrastar DC HC580 WUH722424ALE6L4 - Hard Drive - 24 TB - Internal - 3.5" (8.9 cm) - SATA 6Gb/s - 7200 RPM - Buffer: 512 MB	24 TB	$749.99	$31.25	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Skyhawk ST6000VX001 6TB 3.5" Internal Hard Drive - SATA	6 TB	$209.94	$34.99	NAS HDD · SATACMR	-	Buy on Amazon
Toshiba N300 PRO 24TB Large-Sized Business NAS (up to 24 Bays) 3.5-Inch Internal Hard Drive - Up to 550 TB/Year Workload Rate CMR SATA 6 Gb/s 7200 RPM 1.0 GB Cache - HDWG82EXZSTB	24 TB	$844.99	$35.21	NAS HDD · SATACMR	-	Buy on Amazon
Toshiba N300 8TB NAS 3.5-Inch Internal Hard Drive - CMR SATA 6 GB/s 7200 RPM 512 MB Cache - HDWG780XZSTA	8 TB	$282.51	$35.31	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf Pro 24TB Enterprise NAS Internal HDD Hard Drive – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 512MB Cache for RAID Network Attached Storage, Rescue Services (ST24000NT002)	24 TB	$848.86	$35.37	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
IronWolf ST12000VN0008 Hard Drive	12 TB	$429.99	$35.83	NAS HDD · SATACMR	-	Buy on Amazon
Seagate Skyhawk AI 24TB Video Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 512MB Cache for DVR NVR Security Camera System with in-House Rescue Services (ST24000VE002)	24 TB	$859.99	$35.83	NAS HDD · SATACMR	-	Buy on Amazon
Seagate Skyhawk AI 20TB Video Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 512MB Cache for DVR NVR Security Camera System with in-House Rescue Services (ST20000VE003)	20 TB	$719.99	$36.00	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf Pro 14 TB NAS RAID Internal Hard Drive - 7,200 RPM SATA 6 Gb/s 3.5-inch (ST14000NE0008)	14 TB	$509.00	$36.36	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf Pro 24TB Enterprise NAS Internal HDD Hard Drive – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 512MB Cache for RAID Network Attached Storage, Rescue Services (ST24000NTZ02)	24 TB	$899.97	$37.50	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
WD Ultrastar DC HC570 0F48155 22 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method	22 TB	$829.99	$37.73	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Toshiba N300 20TB NAS 3.5-Inch Internal Hard Drive - CMR SATA 6 GB/s 7200 RPM 512 MB Cache - HDWG62AXZSTA	20 TB	$759.95	$38.00	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf 12TB, Interne Harde Schijf, voor NAS RAID, NAS, 3.5", SATA 6 GB/s, 7200 RPM, 265 MB Cache, FFP, Data Rescue Service (ST12000VNZ008)	12 TB	$457.30	$38.11	NAS HDD · SATACMR	-	Buy on Amazon
Seagate Skyhawk AI 16TB Video Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 256MB Cache for DVR NVR Security Camera System with Drive Health Management and in-House Rescue Services (ST16000VE000)	16 TB	$615.00	$38.44	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital Ultrastar DC HC550 18 TB Hard Drive - 3.5 Internal - SATA	18 TB	$694.45	$38.58	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital 10TB WD Red Plus NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 GB/s, CMR, 512 MB Cache, 3.5" - WD100EFGX	10 TB	$389.99	$39.00	NAS HDD · SATACMR	Prime	Buy on Amazon
Seagate IronWolf Pro ST14000NE0008 14 TB Hard Drive - 3.5" Internal - SATA (SATA/600)	14 TB	$550.00	$39.29	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf Pro ST16000NE000 16 TB Hard Drive - 3.5" Internal - SATA (SATA/600), Mechanical Hard Disk	16 TB	$634.75	$39.67	NAS HDD · SATACMR	-	Buy on Amazon
Seagate ST18000NM003D 18TB Exos X20 SATA Hard Drive, 3.5" HDD, SATA 6Gb/s, 7200rpm, 256MB Cache, 512E, 4.16ms, NCQ	18 TB	$715.00	$39.72	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
HGST WD Ultrastar DC HC510 10TB 7200 RPM SATA 6Gb/s 3.5" Helium Platform Enterprise Hard Disk Drive - HUH721010ALE604 (0F27606)	10 TB	$399.00	$39.90	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Toshiba N300 PRO 12TB Large-Sized Business NAS (up to 24 bays) 3.5-Inch Internal Hard Drive - Up to 300 TB/year Workload Rate CMR SATA 6 GB/s 7200 RPM 512 MB Cache - HDWG51CXZSTB	12 TB	$478.99	$39.92	NAS HDD · SATACMR	-	Buy on Amazon
Seagate Technology ST20000NM002H 20TB Exos X24 HDD 3.5 SATA 7200 ISE Bare Hard Drive	20 TB	$799.99	$40.00	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Exos X24 24TB Enterprise Internal Hard Drive HDD - 6GB/s SATA 7200RPM 2.5M MTBF (ST24000NM002H)	24 TB	$959.99	$40.00	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital 18TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD181KFGX	18 TB	$729.99	$40.56	NAS HDD · SATACMR	Prime	Buy on Amazon
Seagate IronWolf 14TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 256MB Cache for RAID Network Attached Storage – Frustration Free Packaging (ST14000VN0008)	14 TB	$569.75	$40.70	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD202KFGX	20 TB	$814.99	$40.75	NAS HDD · SATACMR	Prime	Buy on Amazon
Western Digital 24TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" -WD241KFGX	24 TB	$979.99	$40.83	NAS HDD · SATACMR	Prime	Buy on Amazon
Western Digital WD Ultrastar HC570 WUH722222ALE6L4 22TB 7200RPM 3.5'' Desktop HDD 0F48155	22 TB	$899.99	$40.91	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital 16TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD161KFGX	16 TB	$654.99	$40.94	NAS HDD · SATACMR	Prime	Buy on Amazon
for Enterprise Hard Disk ST18000NM000J 18TB Exos X18 7200 RPM	18 TB	$739.68	$41.09	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Toshiba N300 10TB NAS 3.5-Inch Internal Hard Drive - CMR SATA 6 Gb/s 7200 RPM 512 MB Cache - HDWG71AXZSTA	10 TB	$414.99	$41.50	NAS HDD · SATACMR	-	Buy on Amazon
Seagate Exos X14 ST12000NM0008 12 TB Hard Drive - 3.5" Internal - SATA (SATA/600)	12 TB	$499.97	$41.66	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate IronWolf ST4000VN006 4 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method	4 TB	$167.49	$41.87	NAS HDD · SATACMR	-	Buy on Amazon
Toshiba MG09ACA18TE 18 TB Hard Drive - 3.5 Internal - SATA [SATA/600]	18 TB	$754.00	$41.89	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Exos X20 ST20000NM007D 20TB 7.2K RPM SATA 6Gb/s 3.5in Hard Drive	20 TB	$839.99	$42.00	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital 3TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" -WD30EFPX	3 TB	$126.22	$42.07	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital Ultrastar WUH722014CLE6L4 14 TB Hard Drive - 3.5" Internal - SATA - Energy-Assisted Magnetic Recording (EAMR) - Server Device Supported - 7200rpm - 512e Format - 512 MB Buffer	14 TB	$589.99	$42.14	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate 14TB HDD Exos X14 7200 RPM 512e/4Kn SATA 6Gb/s 256MB Cache 3.5-Inch Enterprise Hard Drive (ST14000NM0018)	14 TB	$592.41	$42.32	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital WD Red Plus Internal Hard Drive 6 TB CMR 3.5 Inch SATA 5400 rpm 256 MB NAS (Amazon.co.jp Limited)	6 TB	$254.50	$42.42	NAS HDD · SATACMR	Prime	Buy on Amazon
Western Digital WUH721414ALE6L4 14TB Ultrastar DC HC530 SATA HDD - 7200 RPM Class, SATA 6 Gb/s, 512MB Cache, 3.5"	14 TB	$594.75	$42.48	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Skyhawk AI 14TB Surveillance Internal Hard Drive HDD–3.5 Inch SATA 6Gb/s 256MB Cache with Drive Health Management + 3-Year Rescue Service (ST14000VE0008)	14 TB	$594.75	$42.48	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf 4TB NAS Internal Hard Drive CMR 3.5 Inch SATA 6Gb/s 5400 RPM 64MB Cache for RAID Network Attached Storage Rescue Services (ST4000VNZ06/006)	4 TB	$169.99	$42.50	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital 8TB WD Red Plus NAS Internal Hard Drive HDD - 5640 RPM, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5" - WD80EFZZ	8 TB	$339.99	$42.50	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital 8TB WD Red Plus NAS Internal Hard Drive HDD - 5640 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" - WD80EFPX	8 TB	$339.99	$42.50	NAS HDD · SATACMR	Prime	Buy on Amazon
Seagate IronWolf ST12000VN0007 12 TB 3.5 Internal Hard Drive - SATA - 7200rpm - 256 MB Buffer	12 TB	$515.00	$42.92	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf 18TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage, Rescue Services – Frustration Free Packaging (ST18000VNZ00)	18 TB	$774.45	$43.03	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf 16TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6GB/S 7200 RPM 256MB Cache for Raid Network Attached Storage, with Rescue Service (ST16000VN001)	16 TB	$691.45	$43.22	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital Ultrastar DC HC550 WUH721816ALE6L4 0F38462 16TB 7.2K RPM SATA 6Gb/s 512e 512MB 3.5" SE HDD	16 TB	$694.45	$43.40	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate IronWolf Pro 12TB NAS Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage Data Recovery Service – Frustration Free Packaging (ST12000NEZ008)	12 TB	$524.45	$43.70	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf Pro ST12000NE0008 12 TB Hard Drive - 512E Format - SATA 600-3.5" Drive - Internal - 7200RPM - 256 MB Buffer - Hot Pluggable	12 TB	$524.45	$43.70	NAS HDD · SATACMR	-	Buy on Amazon
Seagate Exos 12TB Internal Hard Drive Enterprise HDD – 3.5 Inch 6Gb/s 128MB Cache for Enterprise, Data Center – Frustration Free Packaging (ST12000NM0007)	12 TB	$525.00	$43.75	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate IronWolf Pro 14TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6Gb/s 256MB Cache for RAID Network Attached Storage, Data Recovery Service – Frustration Free Packaging (ST14000NEZ008)	14 TB	$614.45	$43.89	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf 10TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage, with Rescue Service (ST10000VN0008)	10 TB	$439.99	$44.00	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital 22TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD221KFGX	22 TB	$969.99	$44.09	NAS HDD · SATACMR	Prime	Buy on Amazon
16TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6GB/S 7200 RPM 256MB Cache for Raid Network Attached Storage, Data Recovery Rescue Service (ST16000NE000)	16 TB	$705.84	$44.12	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital 8TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD85PURZ	8 TB	$354.99	$44.37	NAS HDD · SATACMR	Prime	Buy on Amazon
Western Digital WD Red Plus Internal Hard Drive 8TB CMR 3.5 inch SATA 5640 RPM 256MB NAS WD80EFPX-AJP Eco Package	8 TB	$355.26	$44.41	NAS HDD · SATACMR	Prime	Buy on Amazon

Live cost to populate every bay

Configuration	Raw	Est. usable	Lowest live new-drive total	Usable $/TB
8 × 8TB	64TB	50.9TB	$2,260.08	$44.37
8 × 12TB	96TB	76.4TB	$2,639.92	$34.55
8 × 16TB	128TB	101.9TB	$4,920.00	$48.30
8 × 20TB	160TB	127.3TB	$5,759.92	$45.24
8 × 24TB	192TB	152.8TB	$5,999.92	$39.27

Usable estimates assume one-drive protection and include the calculator's binary/filesystem allowance. Open the calculator for SHR-2 or RAID 6.

Drive choices for an eight-bay array

Priority	Recommended class	Why it fits eight bays	Trade-off
Best overall	NAS-rated CMR	Balanced acoustics, vibration handling and warranty	Often costs more than enterprise deals
Lowest realistic new $/TB	Safe-filtered NAS or enterprise SATA	The live table removes suspicious capacity/price rows	Confirm seller and warranty
High capacity	20TB or 24TB CMR	Large usable pool without expansion chassis	Long rebuilds and large upfront bill
Noise-sensitive	Mainstream lower-RPM NAS family	Eight seek actuators can be very audible	Lower peak throughput
Workload-heavy	Pro/enterprise SATA	Higher workload tiers and sustained operation focus	More heat, vibration and sound
Budget	New mainstream CMR	Avoids used/recertified fleet uncertainty	Do not sacrifice backups to fund capacity

Eight-bay capacity planning

Configuration	Raw	SHR-1 / RAID 5 est. usable	SHR-2 / RAID 6 est. usable	Cost method
8 × 8TB	64TB	50.9TB	43.7TB	Eight times current per-drive price
8 × 12TB	96TB	76.4TB	65.5TB	Eight times current per-drive price
8 × 16TB	128TB	101.9TB	87.3TB	Eight times current per-drive price
8 × 20TB	160TB	127.3TB	109.1TB	Eight times current per-drive price
8 × 24TB	192TB	152.8TB	131.0TB	Eight times current per-drive price

Why the cheapest disk is not automatically best

An eight-drive set multiplies every weakness: inconsistent warranty, high vibration, harsh seek noise and power draw all become array-level concerns. A slightly more expensive mainstream NAS drive can be better value in a nearby office, while enterprise models can be excellent in a rack or utility room.

Rebuilds touch every surviving disk. CMR, a verified backup, SMART monitoring and enough free space matter more than shaving a small amount from one drive's price. SHR-2 or RAID 6 is easier to justify at eight bays because a second failure during a long rebuild is a credible risk.

Condition, interface and price safeguards

The live table is new-condition only and requires a 3.5-inch internal SATA CMR classification. USB external drives, portable SSDs, DAS enclosures, SAS disks, cables and adapters cannot pass the query.

A price-per-terabyte sanity floor prevents implausible listings such as a low-cost accessory or counterfeit-capacity SSD from becoming the headline bargain. Renewed and recertified products may have a place in noncritical pools, but they are deliberately not mixed into this new-drive ranking.

Frequently asked questions

What drive size is best for an eight-bay DS1825neo+?

Twelve-to-20-terabyte drives are a practical range for many buyers. Eight-terabyte disks lower entry cost; 24TB maximizes internal capacity. Compare complete eight-drive cost and usable $/TB above.

Should I use SHR-2 on an eight-bay NAS?

SHR-2 or RAID 6 is sensible when availability matters because it survives two drive failures. SHR-1 yields more capacity but exposes the array to a second failure during rebuild.

Are enterprise drives too loud for the DS1825neo+?

They can be. Eight enterprise disks may produce noticeable seek noise and vibration. Use mainstream NAS drives for a nearby workspace or place the chassis away from occupied rooms.

Independent US storage-value site: NAS drives, DIY/TrueNAS build parts, and hard-drive shucking, ranked by live $/TB. Not affiliated with or endorsed by Synology, UGREEN, QNAP, TerraMaster, Seagate, Western Digital or Toshiba. All trademarks belong to their owners.

Last updated: 2026-09-12 06:02:12 UTC. As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date indicated on Amazon.com and are subject to change. Any price displayed at the time of purchase will apply. CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON SERVICES LLC. THIS CONTENT IS PROVIDED AS IS AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.