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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Synology DiskStation DS223J Network Storage Drive (White)

Product ID: 595837483

Details

Brand
Synology
Colour
White
Material
Acrylonitrile
Product dimensions
16.5D x 10W x
Size
2-Bay

💾2-Bay HDD Expansion

🔒Comprehensive Data Protection

☁️Private Cloud Access Anywhere

Description

💼 Own Your Cloud, Command Your Data

YOUR DATA YOUR RULES - Enjoy 100% ownership and control with a secure private cloud that keeps your files safe and accessible only to you.
RELIABLE PEACE OF MIND - Backed by a 3-year warranty and robust data protection features, your digital assets are safeguarded for the long haul.
PLUG AND PLAY SIMPLICITY - User-friendly setup and intuitive Synology apps make managing your storage and sharing a breeze—no IT degree required.
DUAL BAY STORAGE POWERHOUSE - Expand your digital universe with 2 bays for up to 2 HDDs, perfect for massive media libraries or critical backups.
SEAMLESS MULTI PLATFORM SYNC - Effortlessly access and share files across Android, iPhone, Windows, and macOS—stay connected wherever work or life takes you.

The Synology DiskStation DS223J is a compact, dual-bay NAS designed for professionals and creatives seeking secure, private cloud storage with seamless multi-device access. Compatible with Android, iOS, Windows, and macOS, it offers easy setup, comprehensive backup options, and reliable performance backed by a 3-year warranty—ideal for managing large media libraries or critical work files from anywhere.

Specifications

ASIN	B0C8814GKB
Best Sellers Rank	56,399 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 35 in Network Attached Storage (NAS) Enclosures
Box Contents	1 x Main Unit, 1 x Accessory Pack, 1 x Quick Installation Guide
Brand Name	Synology
Colour	White
Compatible Devices	Android Phone, Windows PC, iPhone, macOS
Customer Reviews	4.5 4.5 out of 5 stars (845)
Enclosure Material	Acrylonitrile Butadiene Styrene (ABS)
Global Trade Identification Number	00846504004768
Is Assembly Required	Yes
Item Dimensions D x W x H	16.5D x 10W x 22.6H centimetres
Item Type Name	NAS
Item Weight	0.87 Kilograms
Manufacturer	Synology
Manufacturer Part Number	DS223j
Model Number	DS223j
Mounting Type	Tabletop
Number of Items	1
Product Warranty	3 Years
Size	2-Bay
UPC	846504004768

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