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
Material
Plastic Glass
Product Dimensions
6.5"D x 3.94"W
Size
2-bay

🌐multi-platform private cloud access

💾2-bay expandable storage

🔒comprehensive data protection

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€ 390.88

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Details

Brand
Synology
Color
White
Material
Plastic Glass

Description

🚀 Elevate your data game with Synology DS223j — your private cloud powerhouse!

SMART ENERGY SAVER - Schedule power on/off times to reduce energy use and extend device lifespan.
DUAL BAY FLEXIBILITY - Customize storage with two bays—scale up as your data grows without breaking the bank.
SEAMLESS FILE SHARING - Keep teams and clients in sync with easy, secure sharing and syncing capabilities.
PLUG PLAY USB BACKUP - Instantly transfer and back up legacy drives via USB without complicated setups.
EFFORTLESS PRIVATE CLOUD - Own your data with secure, anywhere access across all your devices.

The Synology 2-Bay DiskStation DS223j is a compact, energy-efficient NAS solution designed for professionals seeking secure, private cloud storage. Featuring two drive bays for scalable storage, multi-platform access, and comprehensive backup options, it empowers seamless file sharing and data protection. With a sleek design, intuitive DiskStation Manager interface, and smart power scheduling, it’s perfect for managing and safeguarding your digital assets without relying on third-party clouds.

Specifications

ASIN	B0C8814GKB
Best Sellers Rank	#3 in Network Attached Storage (NAS) Enclosures
Brand	Synology
Built-In Media	Item
Color	White
Compatible Devices	Android, Desktop, Laptop, iPhone
Customer Reviews	4.4 out of 5 stars 776 Reviews
Enclosure Material	Plastic, Tempered Glass
Global Trade Identification Number	00846504004768
Is Assembly Required	Yes
Item Dimensions D x W x H	6.5"D x 3.94"W x 8.9"H
Item Weight	0.87 Kilograms
Manufacturer	Synology
Material	Plastic, Tempered Glass
Mfr Part Number	DS223j
Model Number	DS223j
Mounting Type	Tabletop
Product Dimensions	6.5"D x 3.94"W x 8.9"H
Size	2-bay
UPC	846504004768
Unit Count	1.0 Count
Warranty Description	2 years

Reviews

W**N

26.06.2024

K**J

24.04.2026

A**V

22.07.2024

P**R

2.04.2026

K**N

6.04.2026

M**E

15.12.2025

J**N

29.09.2023

D**R

27.04.2026

L**1

13.09.2025

C**E

4.11.2023

V**T

17.02.2024

T**.

31.01.2026

M**N

8.02.2026

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