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

⚡Fast cross-platform access

🔒100% private cloud ownership

🛡️Comprehensive data protection

A$468

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Description

🔐 Elevate your digital workspace with private, powerful storage.

ROCK SOLID BACKUP - Protect your media and documents with versatile backup destinations.
COMPACT POWERHOUSE - Sleek tabletop design fits perfectly in any modern workspace.
TRUSTED RELIABILITY - Backed by a 2-year warranty and Synology’s renowned support.
OWN YOUR DATA ALWAYS - Secure private cloud ensures your files stay yours, no compromises.
SEAMLESS SYNC SHARE - Effortlessly access and share files across Android, iOS, Windows, and macOS.

The Synology DiskStation DS223J is a compact, user-friendly NAS device offering secure private cloud storage with cross-platform compatibility. It enables easy file sharing and syncing, comprehensive backup options, and comes with a 2-year warranty, making it an ideal solution for professionals seeking reliable and private data management.

Specifications

ASIN	B0C8814GKB
Best Sellers Rank	#8,976 in Computers ( See Top 100 in Computers ) #6 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 (840)
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
Number of Items	1
Number of Packs	1
Size	6.5 inches x 3.94 inches x 8.9 inches
UPC	846504004768

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A$468

Duties & taxes included

In stock

Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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