Updated 3 hours ago · Specifications verified October 12, 2026

Fill the DS1825+'s Eight Bays

Eight bays, 24TB per bay on Synology's list, 144TB usable in SHR-2

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Quick answer

The DS1825+ has eight SATA bays, and Synology's compatibility list for it goes up to 24TB per drive, so the internal bays hold 192TB raw. On the DS1825+, two DX525 expansion units take it to 18 bays. Start from SHR-2, two drives of protection: eight 24TB drives then give 144TB of space. The list contains 22 hard drives, all Synology's own; from DSM 7.3 it also builds storage pools on third-party NAS drives, which are the cheaper table below.

As of October 12, 2026

Best price per TB

$62.50

In-stock listings in the tables on this page

Prices updated

3 hours ago

What eight bays hold on the DS1825+

Drive size	Raw (8 drives)	Usable, one drive of protection	Usable, two drives of protection
8TB	64TB	56TB	48TB
12TB	96TB	84TB	72TB
16TB	128TB	112TB	96TB
20TB	160TB	140TB	120TB
24TB	192TB	168TB	144TB

The layout to start from with eight bays

With eight bays, a rebuild reads seven other drives end to end, so two drives of protection is the layout to start from. It keeps six drives of space.

The DS1825+ allows a single volume of up to 200TB only with 32GB of memory; with less, the limit is 108TB. Eight 20TB drives in SHR-2 already come to 120TB, so from that drive size up you either fit 32GB or split the space into more than one volume.

Hard drives on Synology's list for the DS1825+

Series	Capacities listed
HAT3300 (Plus)	2, 4, 6, 8, 12TB
HAT3310 (Plus)	8, 12, 16TB
HAT3320 (Plus)	8, 20TB
HAT5300 (Enterprise)	4, 8, 12, 16TB
HAT5310 (Enterprise)	8, 16, 18, 20TB
HAT5320 (Enterprise)	4, 8, 20, 24TB

DS1825+ storage specifications

	DS1825+
Drive bays	8 x 3.5-inch or 2.5-inch SATA
M.2 slots	2 x M.2 2280 NVMe
Most bays with expansion	18 (DX525 × 2)
RAID types	SHR, Basic, JBOD, RAID 0, RAID 10, RAID 1, RAID 5, RAID 6
Largest single volume	200TB with 32GB of memory, otherwise 108TB
Power draw (Synology's test)	60.1W in use, 18.34W with drives hibernating
Noise (Synology's test)	23.8 dB(A)
Size and weight	166 mm × 343 mm × 243 mm, 6 kg

Where the DS1825+ figures come from

Read from Synology's DS1825+ product page and compatibility list on October 12, 2026. Capacities are bays times drive size in decimal terabytes.

Checked on October 12, 2026. Sources: Synology DS1825+ technical specifications; Synology compatibility list for the DS1825+; Synology Knowledge Center: Drive compatibility policies for systems from 2025 (DSM 7.3 and above).

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Only DS1825+ specifics are on this page.

NAS drive basics: CMR, NAS-rated drives and SHR · Synology DSM 7.3 third-party drive policy

The DS1825+ on Amazon.com today

New listings of the DS1825+ itself, including bundles sold with drives fitted, which are labelled.

The DS1825+ has no new, in-stock listing on Amazon.com right now.

Drives on Synology's DS1825+ list, in stock

Synology HAT series drives, the only hard drives on Synology's compatibility list for the DS1825+.

Price per

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1 products

Product	Capacity	Price	$ / TB	Type	Prime	Buy
Synology HAT5300-16T 16 TB Hard Drive - 3.5" Internal - SATA (SATA/600)	16 TB	$999.99	$62.50	NAS HDD · SATACMR	-	Buy on Amazon

Third-party NAS drives up to 24TB, by price per TB

Not on Synology's list. Supported for storage pools on the DS1825+ from DSM 7.3.

Price per

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60 products

Product	Capacity	Price	$ / TB	Type	Prime	Buy
TOSHIBA N300 Internal Hard Drive 22 Tb 7200 RPM 512 Mb 3.5", W129161818 (Tb 7200 RPM 512 Mb 3.5 Serial Ata Iii)	22 TB	$799.99	$36.36	NAS HDD · SATACMR	-	Buy on Amazon
DC HC550 16TB 512MB SATA Ultra SE NP3	16 TB	$589.45	$36.84	Enterprise HDD · SATACMREnterprise	-	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	$521.00	$37.21	NAS HDD · SATACMR	-	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	$525.00	$37.50	NAS HDD · SATACMR	-	Buy on Amazon
Toshiba - HDWG82AXZSTB - Toshiba N300 Pro HDWG82AXZSTB 20 TB Hard Drive - 3.5 Internal - SATA (SATA/600) - Conventional	20 TB	$766.99	$38.35	NAS HDD · SATACMR	-	Buy on Amazon
Toshiba MG Series Enterprise 12TB 3.5’’ SATA 6Gbit/s Internal HDD 7200RPM 550TB/year 24/7 Operation. MG07ACA12TE	12 TB	$469.99	$39.17	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate IronWolf Pro, 16 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage (ST16000NT001)	16 TB	$629.99	$39.37	NAS HDD · SATACMR	-	Buy on Amazon
Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J	18 TB	$712.00	$39.56	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Enterprise Capacity \| ST10000NM0016 \| 10TB 7200 RPM SATA 6.0Gb/s 256MB Cache Hyperscale 512e 3.5" Hard Disk Drives	10 TB	$399.95	$39.99	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Exos X10 ST10000NM0126 10TB 7200 RPM SATA 6Gb/s 512e 256MB 3.5in Enterprise Hard Drive	10 TB	$399.99	$40.00	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate IronWolf Pro ST14000NE0008 14 TB Hard Drive - 3.5" Internal - SATA (SATA/600)	14 TB	$565.92	$40.42	NAS HDD · SATACMR	-	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	$581.00	$41.50	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate IronWolf Pro, 20 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage (ST20000NT001)	20 TB	$829.99	$41.50	NAS HDD · SATACMR	-	Buy on Amazon
Seagate 20TB Exos Enterprise Hard Drive \| SATA (ST20000NM002H)	20 TB	$829.99	$41.50	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Toshiba - HDWG81GXZSTB - Toshiba N300 Pro HDWG81GXZSTB 16 TB Hard Drive - 3.5 Internal - SATA (SATA/600) - Conventional	16 TB	$685.50	$42.84	NAS HDD · SATACMR	-	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	$600.00	$42.86	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	$429.00	$42.90	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Exos X18 Enterprise Class, 16TB, Enterprise Internal Hard Drive, SATA, 3,5" 6Gbit/s, 128MB Cache (ST16000NM000J)	16 TB	$686.91	$42.93	Enterprise HDD · SATACMREnterprise	-	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" - WD221KFGXSold by Amazon	22 TB	$958.88	$43.59	NAS HDD · SATACMR	Prime	Buy on Amazon
Toshiba 22TB Enterprise Internal Hard Drive – MG Series 3.5" SATA HDD for Server, Storage, 24/7 Operation, Hyperscale, Cloud (MG10AFA22TE)	22 TB	$959.95	$43.63	Enterprise HDD · SATACMREnterprise	-	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" - WD202KFGXSold by Amazon	20 TB	$880.96	$44.05	NAS HDD · SATACMR	Prime	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	$793.99	$44.11	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital 24TB WD Gold Enterprise Class SATA Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD242KRYZSold by Amazon	24 TB	$1,059.99	$44.17	Enterprise HDD · SATACMREnterprise	Prime	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	$619.99	$44.29	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	$534.99	$44.58	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	$713.45	$44.59	NAS HDD · SATACMR	-	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" - WD161KFGXSold by Amazon	16 TB	$714.99	$44.69	NAS HDD · SATACMR	Prime	Buy on Amazon
Seagate IronWolf 10Tb NAS Internal Hard Drive HDD – 3.5 Inch SATA 6GB/S 7200 RPM 256MB Cache for Raid Network Attached Storage (ST10000VN0004)	10 TB	$449.99	$45.00	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf 10TB NAS Internal Hard Drive, 3.5" SATA 6Gb/s, 7200 RPM, CMR, RAID Optimized, IronWolf Health Management – for NAS Systems (ST10000VNZ00)	10 TB	$449.99	$45.00	NAS HDD · SATACMR	-	Buy on Amazon
Seagate Exos X14 ST12000NM0008 12 TB Hard Drive - 3.5" Internal - SATA (SATA/600)	12 TB	$540.38	$45.03	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
HGST - WD Ultrastar DC HC520 HDD \| HUH721212ALE600 \| 12TB 7.2K SATA 6Gb/s 256MB Cache 3.5-Inch Helium Data Center Internal Hard Disk Drive	12 TB	$541.45	$45.12	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital 12TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD122KFBXSold by Amazon	12 TB	$541.68	$45.14	NAS HDD · SATACMR	Prime	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" - WD100EFGXSold by Amazon	10 TB	$455.75	$45.58	NAS HDD · SATACMR	Prime	Buy on Amazon
Seagate IronWolf Pro ST12000NE0008 12 TB Hard Drive - 3.5" Internal - SATA (SATA/600)	12 TB	$550.00	$45.83	NAS HDD · SATACMR	-	Buy on Amazon
Seagate IronWolf Pro 16TB 7200 RPM SATA 6Gb/s 3.5" NAS HDD (ST16000NE000)	16 TB	$735.32	$45.96	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	$744.45	$46.53	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital 16TB WD Gold Enterprise Class Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD161KRYZSold by Amazon	16 TB	$749.00	$46.81	Enterprise HDD · SATACMREnterprise	Prime	Buy on Amazon
WD WUS721010ALE6L4 Ultrastar DC HC330 0B42266 10TB 7200 RPM SATA 6Gb/s 256MB Cache 3.5-Inch Enterprise Hard Drive	10 TB	$471.45	$47.15	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Toshiba MG09ACA18TE 18 TB Hard Drive - 3.5 Internal - SATA [SATA/600]	18 TB	$849.99	$47.22	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Constellation ES.3 ST4000NM0033 4 TB Hard Drive - 3.5 Internal - SATA	4 TB	$189.27	$47.32	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Exos X24 3.5" Internal Hard Drive - 12TB, Single, SATA III 6 Gb/s	12 TB	$569.99	$47.50	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Exos X20 ST20000NM007D 20TB 7.2K RPM SATA 6Gb/s 3.5in Hard Drive	20 TB	$950.00	$47.50	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate IronWolf Pro, 14 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage (ST14000NT001)	14 TB	$667.00	$47.64	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital 20TB WD Gold Enterprise Class SATA Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD203KRYZ	20 TB	$953.99	$47.70	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital 8TB WD Gold Enterprise Class Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, 256 MB Cache, 3.5" - WD8005FRYZSold by Amazon	8 TB	$387.99	$48.50	Enterprise HDD · SATACMREnterprise	Prime	Buy on Amazon
Western Digital 22TB WD Gold Enterprise Class SATA Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD221KRYZ	22 TB	$1,067.31	$48.51	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	$584.45	$48.70	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital WUH721816ALE6L4 3.5" 16TB SATA 6Gb/s7.2K RPM 512M 0F38462 512e/4Kn HDD	16 TB	$784.45	$49.03	Enterprise HDD · SATACMREnterprise	-	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	$884.45	$49.14	NAS HDD · SATACMR	-	Buy on Amazon
Seagate Exos X18 ST18000NM001J 18 TB Hard Drive - Internal - SATA (SATA/600)	18 TB	$884.45	$49.14	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Western Digital 12TB WD Gold Enterprise Class Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD122KRYZSold by Amazon	12 TB	$594.99	$49.58	Enterprise HDD · SATACMREnterprise	Prime	Buy on Amazon
WD Red Pro 18TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR, 512MB Cache	18 TB	$894.45	$49.69	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital Ultrastar WUH722020CLE6L4 20 TB Hard Drive - 3.5" Internal - SATA - Energy-Assisted Magnetic Recording (EAMR) Method	20 TB	$999.00	$49.95	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Toshiba 4TB Enterprise Internal Hard Drive – MG Series 3.5" SATA HDD for Server, Storage, 24/7 Operation, Hyperscale, Cloud (MG04ACA400E)	4 TB	$199.99	$50.00	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate Exos 7E8 4TB 512n SATA 128MB Cache 3.5-Inch Enterprise Hard Drive (ST4000NM0035), Mechanical Hard Disk	4 TB	$200.00	$50.00	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate 8TB Enterprise Capacity 3.5 HDD 7200RPM SATA 6Gbps 256 MB Cache Internal Bare Drive (ST8000NM0055)	8 TB	$400.00	$50.00	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon
Seagate IronWolf 10TB NAS Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache RAID Network Attached Storage Home Servers - (ST10000VN0008)	10 TB	$500.00	$50.00	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital 14TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" -WD142KFGXSold by Amazon	14 TB	$701.45	$50.10	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	$405.08	$50.64	NAS HDD · SATACMR	-	Buy on Amazon
Western Digital 18TB WD Gold Enterprise Class Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD181KRYZ	18 TB	$924.30	$51.35	Enterprise HDD · SATACMREnterprise	-	Buy on Amazon

Frequently asked questions

How much storage can the DS1825+ hold?

192TB raw with eight 24TB drives, which is 144TB in SHR-2, two drives of protection. Beyond that, two DX525 expansion units take it to 18 bays, which is 432TB raw.

Which RAID should I use on the DS1825+?

SHR-2, two drives of protection. With eight bays, a rebuild reads seven other drives end to end, so two drives of protection is the layout to start from.

Does the volume limit on the DS1825+ affect large drives?

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