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Synology 8 Bay NAS DiskStation ds1821 and Western Digital My Cloud EX4100 are closely matched nas storage devices with nearly identical overall scores (53 vs 51). The best choice depends on which specific features matter most to you.
Scores are relative within the nas storagecategory. Percentages show each dimension's weight in the overall score. A difference of less than 0.5 points is considered a tie.
✓ Pros
✓ Pros
✗ Cons
| Spec | Synology 8 Bay NAS DiskStation ds1821 | Western Digital My Cloud EX4100 |
|---|---|---|
| Price | 399$✓ | 499$ |
| RAM | 4GB✓ | 2GB |
| OS | DiskStation Manager (DSM) | My Cloud OS 3 |
| Weight | 1500g | 1100g✓ |
| Dimensions | 166 x 243.5 x 223.5 mm | 170 x 150 x 220 mm |
| Colors | Black | Black |
Buy Synology 8 Bay NAS DiskStation ds1821 if…
Choose the Synology 8 Bay NAS DiskStation ds1821 if budget is your top priority — it offers competitive specs at a lower price point.
Buy Western Digital My Cloud EX4100 if…
The Western Digital My Cloud EX4100 is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Synology 8 Bay NAS DiskStation ds1821 and Western Digital My Cloud EX4100 are closely matched nas storage devices with nearly identical overall scores (53 vs 51). The best choice depends on which specific features matter most to you.
Both products score similarly — it depends on your priorities.
Synology 8 Bay NAS DiskStation ds1821 is cheaper at $399 vs $499 for the Western Digital My Cloud EX4100.
Choose the Synology 8 Bay NAS DiskStation ds1821 if budget is your top priority — it offers competitive specs at a lower price point.
The Western Digital My Cloud EX4100 is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Western Digital My Cloud EX4100 is lighter at 1100g vs 1500g.
Synology 8 Bay NAS DiskStation ds1821 has more RAM (4GB vs 2GB), which helps with multitasking.
Reviewed by VersusMatrix Editorial Team
Last updated: April 25, 2026
Methodology: AI-powered analysis of technical specifications from manufacturer data. Scores are calculated by comparing products across multiple dimensions and normalized relative to the full category database. Our editorial process is independent and not influenced by affiliate partnerships.
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