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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DS220j

Product ID: 185803263

Details

Brand
Synology
Cache Size
512
Color
Enclosure
Compatible Devices
Server
Connectivity Technology
Ethernet
Digital Storage Capacity
32 TB

⚡1.4 GHz Quad-Core CPU

🔒Built-in advanced security

☁️Private cloud access

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Description

🚀 Elevate your data game with Synology DS220j — your secure, smart, and sleek private cloud hub!

EXPANDABLE VERSATILE - Supports large HDDs with RAID options for data redundancy and flexible storage management.
MOBILE READY ECOSYSTEM - Sync and manage files effortlessly with Synology’s suite of mobile apps for ultimate convenience.
SEAMLESS PRIVATE CLOUD - Access and share your data anytime, anywhere with easy-to-use private cloud capabilities.
ROCK SOLID DATA SECURITY - Comprehensive built-in security tools protect your files from evolving cyber threats.
POWERFUL QUAD CORE PERFORMANCE - 1.4 GHz Realtek RTD1296 processor ensures smooth multitasking and fast data handling.

The Synology DS220j is a compact, budget-friendly NAS featuring a 1.4 GHz quad-core processor and 2GB RAM, designed for home and small office users. It offers robust built-in security, supports large HDDs with RAID mirroring, and provides seamless private cloud access through an intuitive interface and mobile apps. Ideal for professionals seeking reliable, centralized data storage with remote accessibility and strong data protection.

Specifications

ASIN	B0855LMP81
Best Sellers Rank	#143 in Network Attached Storage (NAS) Enclosures
Brand	Synology
Cache Memory Installed Size	512
Color	Enclosure
Compatible Devices	Server
Connectivity Technology	Ethernet
Customer Reviews	4.5 4.5 out of 5 stars (3,338)
Data Transfer Rate	6 Gigabits Per Second
Digital Storage Capacity	32 TB
Enclosure Material	Metal
Global Trade Identification Number	00846504003440, 04711174723447
Hard Disk Description	Mechanical Hard Disk
Hard Disk Interface	Serial ATA-600
Hard Disk Rotational Speed	0.01 RPM
Hardware Connectivity	Ethernet
Installation Type	Internal Hard Drive
Item Weight	1.94 Pounds
Manufacturer	Synology
Mfr Part Number	DS220j
Model Name	DS220j
Model Number	DS220j
Number of Items	1
UPC	846504003440
Unit Count	1.0 Count

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