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 Attached Storage Drive (White)

Synology DiskStation DS223J Network Attached Storage Drive (White)

Product ID: 548252410

Details

Brand
Synology
Colour
Black
Compatible Devices
Android Phone
Product Dimensions
16.5D x 10W x
Size
2-bay

🌐Multi-platform seamless access

💾2-bay storage up to 32TB

🔄Real-time sync & cloud integration

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Description

🚀 Elevate your data game with Synology DS223J — where storage meets smart collaboration!

EFFORTLESS CLOUD SYNC - Keep your private cloud in harmony with Google Drive, Dropbox, and OneDrive for ultimate control.
COLLABORATE IN REAL TIME - Boost productivity with Synology Office for seamless team collaboration anywhere.
MASSIVE 32 TB STORAGE CAPACITY - Store and safeguard your critical data with expansive dual-bay support.
UNIVERSAL DEVICE COMPATIBILITY - Access and manage files effortlessly across Windows, macOS, Linux, Android, and iOS.
INTEGRATED SURVEILLANCE PHOTO BACKUP - Secure your space and memories with built-in NVR and mobile photo backup solutions.

The Synology DiskStation DS223J is a sleek, 2-bay NAS device designed for professionals seeking reliable data backup, file sharing, and multi-platform access. Supporting up to 32TB raw storage, it integrates Synology Drive for seamless file management, Synology Photos for mobile photo backup, and Surveillance Station for network video recording. Ideal for home offices and small businesses, it offers real-time collaboration, cloud synchronization, and robust security features in a compact, user-friendly package.

Specifications

ASIN	B0C8814GKB
Assembly Required	Yes
Box Contents	Main Unit X 1 Accessory Pack X 1 Quick Installation Guide X 1
Brand	Synology
Brand Name	Synology
Colour	Black
Compatible Devices	Android Phone, Windows PC, iPhone, macOS
Country of Origin	Taiwan
Customer Reviews	4.5 out of 5 stars 762 Reviews
Enclosure Material	Plastic Tempered Glass
Global Trade Identification Number	00846504004768
Importer Contact Information	9F., No.1, Yuandong Rd., Banqiao Dist., New Taipei City 220632, Taiwan
Item Dimensions D x W x H	16.5D x 10W x 22.6H Centimeters
Item Type Name	NAS
Item Weight	0.87 Kilograms
Manufacturer	Synology, Synology Inc., 9F., No.1, Yuandong Rd., Banqiao Dist., New Taipei City 220632, Taiwan
Manufacturer Contact Information	Synology Inc., 9F., No.1, Yuandong Rd., Banqiao Dist., New Taipei City 220632, Taiwan
Manufacturer Part Number	DS223j
Material	Plastic Tempered Glass
Model Number	DS223j
Mounting Type	Floor Mount
Packer Contact Information	9F., No.1, Yuandong Rd., Banqiao Dist., New Taipei City 220632, Taiwan
Product Dimensions	16.5D x 10W x 22.6H Centimeters
Size	2-bay
UPC	846504004768
Unit Count	1 Piece
Warranty Description	2 Years

Reviews

V**T

17.02.2024

V**�

13.08.2024

L**1

13.09.2025

C**E

4.11.2023

W**N

26.06.2024

T**.

31.01.2026

M**N

8.02.2026

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