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: 551197648

Details

Brand
Synology
Colour
Black
Material
Plastic
Product dimensions
16.5D x 10W x
Size
6.5 inches x x

⚡Seamless cross-platform syncing

🔒100% private cloud ownership

🛡️Comprehensive multi-destination backup

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£221.96

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Description

🚀 Elevate your digital workspace with Synology DS223J — your private cloud powerhouse!

TRUSTED RELIABILITY - Backed by a 2-year warranty and Synology’s renowned support for peace of mind.
OWN YOUR DATA ALWAYS - Secure private cloud ensures your files stay yours—no compromises.
PLUG PLAY SIMPLICITY - Easy setup with intuitive OS and helpful guides—get started in minutes, no IT degree needed.
ACCESS ANYWHERE ANYTIME - Effortlessly sync and share across Android, iOS, Windows, and macOS devices.
BACKUP WITHOUT BOUNDARIES - Protect your media and documents with versatile backup options to multiple destinations.

The Synology DiskStation DS223J is a compact, user-friendly NAS designed for home users and small businesses. It offers secure private cloud storage with seamless cross-platform access, robust backup capabilities, and easy file sharing. Compatible with Android, iOS, Windows, and macOS, it ensures your data is always accessible and protected. With a lightweight design, quick installation, and a 2-year warranty, DS223J is the ultimate solution to take control of your digital assets.

Specifications

ASIN	B0C8814GKB
Best Sellers Rank	#8,911 in Computers ( See Top 100 in Computers ) #9 in Network Attached Storage (NAS) Enclosures
Brand	Synology
Built-In Media	Main Unit X 1 Accessory Pack X 1 Quick Installation Guide X 1
Color	Black
Compatible Devices	Android Phone, Windows PC, iPhone, macOS
Customer Reviews	4.5 4.5 out of 5 stars (777)
Enclosure Material	Plastic
Global Trade Identification Number	00846504004768
Is Assembly Required	Yes
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
Mfr Part Number	DS223j
Model Number	DS223j
Mounting Type	Tabletop
Size	6.5 inches x 3.94 inches x 8.9 inches
UPC	846504004768

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