Is the memory upgradable?

No it can't. DS220J memory is fixed at 512 MB. Current software upgrade requires a minimum of 1 GB according to Synology's own notes. Avoid this model/brand.

what physical size harddrives can be used?

The hard drive "size" is not the physical size of the drive itself but the diameter of the platter inside the drive. A standard desktop HDD is 5.75" x 4" but has a 3.5" platter inside. Hence the name 3.5" drive even though it is physically much bigger. A notebook HDD measures 4" x 2.75" and referred to as a 2.5" drive.

If single drive is installed initially, then 2nd drive is added later. does raid 1 get configured? or does both drive need to be installed together?

I installed one drive initially, and then added a second drive later. The second drive was automatically added as a Raid 1 drive.

Can it be used as a datastore for esxi or backup VMs?

Technically you can but not recommended. You will likely get terrible performance because the CPU and memory is not designed for this use case. 512MB RAM is very low for a datastore. This model is really geared towards traditional file sharing and media streaming. You want something with higher CPU and read/wrtie caching like the DS218/DS218+.

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2-Bay DiskStation DS223j (Diskless)

Product ID: 537390513

Details

Brand
Synology
Color
White
Compatible Devices
Android Laptop
Product Dimensions
6.5"D x 3.94"W
Size
2-bay

💾2-bay storage for scalable capacity

📹24/7 IP camera surveillance support

☁️Private cloud with multi-device access

€ 390.28

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Description

🔐 Unlock your data’s potential with Synology’s smart, secure storage solution!

SMART HOME SECURITY - Monitor your property remotely with intelligent video surveillance and multiple camera support.
TRUSTED RELIABILITY - Backed by Synology’s 2-year warranty and expert support for peace of mind.
SEAMLESS COLLABORATION - Keep teams and clients synced with easy file sharing and real-time updates.
EFFORTLESS PRIVATE CLOUD - Own your data with secure, anytime access across all your devices.
AUTOMATED BACKUP ASSURANCE - Set it once, forget it—protect Macs, PCs, and mobiles with multi-destination backups.

The Synology 2-Bay DiskStation DS223j is a compact, energy-efficient NAS designed for professionals seeking secure private cloud storage, automated backups, and intelligent home security. Featuring two drive bays, multi-platform access, and 24/7 IP camera support, it ensures seamless data management and collaboration backed by a 2-year warranty and Synology’s trusted software ecosystem.

Specifications

ASIN	B0C8814GKB
Best Sellers Rank	#2 in Network Attached Storage (NAS) Enclosures
Brand	Synology
Built-In Media	Item
Color	White
Compatible Devices	Android, Desktop, Laptop, iPhone
Customer Reviews	4.5 4.5 out of 5 stars (858)
Global Trade Identification Number	00846504004768
Item Dimensions D x W x H	6.5"D x 3.94"W x 8.9"H
Item Weight	0.87 kg
Manufacturer	Synology
Mfr Part Number	DS223j
Model Number	DS223j
Mounting Type	Tabletop
Number of Items	1
Size	2-bay
UPC	846504004768
Unit Count	1 Count
Warranty Description	2 years

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 390.28

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In stock

Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to GERMANY.

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TrustScore 4.5 | 7,300+ reviews

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