Building 100TB of Storage: Cheapest Configurations Using Live Pricing
Drive costs based on current DatacenterDisk live pricing. Platform costs are estimates.
100 terabytes has become a common benchmark for serious homelab storage builds. At this scale, drive selection and configuration choices have significant cost implications - the difference between the cheapest and most expensive approach to 100TB can exceed $5,000.
Target: Maximum raw capacity at minimum cost. Suitable for media storage, backup archives, non-critical data.
Target: New drives with manufacturer warranty, dual-drive failure tolerance.
Approach: 7 x 20TB new SATA drives in RAID 6 provides approximately 100TB usable. Seagate Exos X20 or WD Ultrastar DC HC570.
Estimated drive cost: $1,400-1,800 total. 5-year warranties from Seagate or WD. New drives with fresh workload ratings reduce correlated failure risk.
Target: Business NAS deployment with data recovery service, 300TB/year workload rating.
Approach: 6 x 20TB Seagate IronWolf Pro 20TB in RAID 6. Includes 3 years of Rescue Data Recovery Services.
Estimated drive cost: $2,400-3,000 total. Best suited for Synology or QNAP NAS platforms.
Target: Maximum density with fewer drives. Fewer drives means fewer failure points.
Approach: 5 x 24TB new SATA drives in RAID 5 provides approximately 96TB usable. Seagate Exos X24 is the current highest density SATA option.
Estimated drive cost: $1,500-2,500 total.
Target: Production server environment with dual-port redundancy.
Synology DiskStation: Purpose-built NAS OS with the best consumer/prosumer software experience. DSM provides a polished web interface, mobile apps, and built-in backup. The DS923+ supports up to 9 drives with expansion and 32GB RAM. Enclosure cost approximately $900-1,100 with expansion unit.
QNAP NAS: More hardware flexibility with PCIe expansion for 10GbE or additional storage controllers. QTS is less polished than DSM but more configurable. TS-664 (6-bay) supports 100TB natively at roughly $600-700.
TrueNAS Scale (custom build): Open-source, ZFS-based. A used Dell PowerEdge R730 or Supermicro chassis with 12-24 bays can be purchased for $300-800 with significantly more processing power than consumer NAS.
UnRAID: Commercial Linux-based NAS OS ($59-129 license). More forgiving of mixed drive configurations than ZFS. Popular for mixed storage/compute deployments.
At 100TB scale, standard gigabit Ethernet (1GbE) saturates at approximately 125MB/s. Upgrading to 2.5GbE costs $30-60 for a compatible switch and nearly doubles throughput. 10GbE provides 1,000+MB/s but at $80-150 per port premium.
Sequential read/write for modern 7200RPM enterprise drives: 200-280MB/s. A RAID 6 array of 6 drives delivers 800-1,200MB/s sequential reads on capable hardware. Random 4K IOPS: 100-200 per drive, 600-1,200 for a 6-drive array.
SSD cache: Both Synology and QNAP support NVMe SSD caching. Adding 2 x 500GB NVMe SSDs dramatically improves random I/O performance for frequently accessed data. Recommended for any deployment with concurrent VM or database use.
RAID is not backup. RAID protects against drive failure but not accidental deletion, ransomware, controller failure, catastrophic enclosure failure, or logical corruption propagated across all drives.
The 3-2-1 backup strategy requires 3 copies of data on 2 different media types with 1 copy offsite. For 100TB this implies 200TB of backup capacity minimum.
Cloud backup at 100TB scale: AWS S3 Glacier Deep Archive at approximately $100/month. Wasabi at $699/month for 100TB. Cloud backup at this scale is costly - factor into total cost planning. Local backup to a second array or LTO tape is more practical for most homelabs.
For most homelab builders in 2026, the optimal configuration is 6-7 x 20TB new SATA drives in RAID 6 - providing 100-120TB usable storage with dual-drive failure protection, 5-year manufacturer warranties, and the best balance of $/TB and risk profile.
Theoretical configurations are useful but actual builds with specific component lists clarify the trade-offs better than abstract recommendations. Three concrete builds at different price points cover most homelab requirements.
Build A — The Budget Hauler ($1,400). Used Dell PowerEdge T630 tower server from eBay at $350, including 8 hot-swap drive bays and built-in PERC H730 RAID controller. Six MDD refurbished 20TB SATA drives at $130 each ($780). Used 32GB DDR4 ECC RAM at $80. Total: $1,360 for approximately 96TB usable in RAID 6. Runs TrueNAS Scale, suitable for media server and backup target workloads. Power draw 90-130W depending on activity.
Build B — The Sweet Spot ($2,100). New Synology DS923+ 4-bay NAS at $620, expansion DX517 5-bay at $480. Six Seagate IronWolf Pro 20TB drives at $280 each ($1,680). Total approximately $2,780 (over the $2,500 limit but listed for comparison). Reduce to four IronWolf Pro 20TB drives without expansion for $2,220 total at 40TB usable — fits the $2,500 budget for half the capacity. Excellent if you value the Synology software experience.
Build C — The Custom TrueNAS ($2,400). New Supermicro CSE-826 2U chassis at $300, X11SSL-F motherboard at $200, Xeon E3-1230 v6 CPU at $80, 64GB ECC RAM at $200. Eight new Seagate Exos X20 20TB drives at $260 each ($2,080). Total $2,860 — adjust to seven drives for $2,600. RAIDZ2 with seven drives provides approximately 100TB usable with two-drive parity. Strong choice for technically proficient builders who value upgradability.
All three builds achieve roughly equivalent capacity at meaningfully different price points. The choice depends on whether your time is more valuable spent building hardware or using the storage.
A 100TB homelab generates real heat and noise that affects where you can practically locate it. Six 7200RPM drives produce approximately 35-50 dB at idle and 45-60 dB under load — louder than a quiet office conversation. For most homes, this rules out bedroom or main-living-area placement.
Thermal management is non-trivial. Six drives in a small enclosure produce 50-80W of waste heat in addition to the server hardware itself. NAS appliances designed for the home market (Synology, QNAP) optimize cooling for low noise but require adequate ambient airflow. Enterprise server hardware (Dell, HPE, Supermicro) uses aggressive cooling fans optimized for datacenter conditions and is significantly louder.
Power consumption for a 100TB build runs 80-180W under typical load depending on drive activity and CPU choice. At US average residential electricity rates of $0.16/kWh, this is $112-252 per year. Over five years, $560-1,260 in electricity cost — meaningful relative to the hardware cost, especially for builds in high-rate utility regions like California or New York at $0.30+/kWh.
Many homelab builders relocate their systems to garage, basement, or dedicated office space specifically to manage noise and heat. A basic 1U or 2U server rack with cable management runs $200-500. For builds in regions with seasonal temperature extremes, basement placement provides natural cooling year-round.
Uninterruptible power supply (UPS) protection is valuable but often skipped on cost grounds. A basic 1000VA UPS sufficient for a homelab NAS runs $150-250. The cost of a single corrupted database or interrupted RAID rebuild during an unexpected power loss can exceed the UPS cost; this is one piece of infrastructure that pays for itself the first time it matters.
Storage hardware is only part of a homelab build — the software stack determines what the storage is actually useful for.
For media server workloads, Plex remains the dominant choice with broad client device support across smart TVs, streaming devices, mobile, and web. Jellyfin is the open-source alternative with no licensing costs. Both work well with TrueNAS Scale, Synology DSM, QNAP QTS, and UnRAID. Hardware transcoding via Intel Quick Sync or NVIDIA GPU significantly improves playback for multiple concurrent streams.
For backup workloads, Veeam Community Edition (free up to 10 instances) provides enterprise-grade backup capabilities at home scale. Synology Active Backup for Business handles file, application, and VM backups within the Synology ecosystem. UrBackup provides cross-platform incremental backup for Windows, macOS, and Linux clients.
For file sharing, all major NAS platforms include SMB, NFS, and AFP support. The choice depends on client devices — SMB for Windows clients, NFS for Linux/UNIX clients, AFP (now legacy) for older macOS. Modern macOS works well with SMB.
For object storage workloads, MinIO can run on TrueNAS Scale to provide S3-compatible object storage at home. Useful for testing applications that will deploy to AWS, GCP, or Azure object storage in production.
For container workloads, TrueNAS Scale's built-in Kubernetes integration runs containerized applications with the NAS itself as the storage backend. Synology Container Manager and Portainer on QNAP provide similar capabilities with simpler interfaces.
For remote access, Tailscale provides zero-configuration secure remote access to your homelab from anywhere. ZeroTier and Cloudflare Tunnel offer similar capabilities. These eliminate the security complexity of opening NAS services to the public internet.
Storage requirements grow over time. A homelab built at 100TB capacity is unlikely to remain at 100TB for the deployment's full life — typical growth is 30-50% per year for active media collections, photo archives, and document backups.
The expansion approach depends on the underlying platform. Synology DiskStation supports Synology Hybrid RAID (SHR) which efficiently uses mixed drive capacities — adding a larger drive expands the array without requiring all drives to match. Practical for incremental expansion over time.
ZFS (TrueNAS) is less flexible. ZFS pools cannot easily expand vdevs by adding drives; the typical expansion path is adding another vdev to the pool. This requires planning vdev composition at initial build time. A pool of two 6-drive RAIDZ2 vdevs is more expandable than a single 10-drive RAIDZ2 vdev.
UnRAID is the most flexible for mixed-drive expansion. Any drive can be added to the array provided it does not exceed the parity drive's capacity. Drives of mixed sizes coexist without efficiency loss. This flexibility comes at a performance cost compared to ZFS or hardware RAID.
The practical recommendation: build initial capacity at 100-130% of current needs, then plan first expansion at 2-3 years when current drive technology has advanced and capacity per dollar has improved. Replacing original 20TB drives with 30TB drives in 2028-2029 will likely produce similar capacity expansion at lower marginal cost than buying additional drives today.
Data in this report is sourced from DatacenterDisk's live price tracking database, covering 247 enterprise storage products. Prices updated every 2 hours from Amazon US via the Amazon Creators API. Published June 26, 2026.
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