The Apple 661-3856 (661-3856 - Apple 100GB 7200RPM SATA 1.5Gb/s 2.5-inch Hard Drive) is a Laptop Hard Drive component engineered for sustained enterprise-class workloads. This part addresses common procurement scenarios where exact-match replacement, capacity expansion, or new-build deployment is required. Technical specifications include capacity of 100 GB, spindle speed of 7,200 RPM, form factor of 2.5-inch, interface of SATA, data rate of 5 Gb/s. Common deployment scenarios include database transaction-log volumes, virtualization datastores, OS-boot tier, backup-repository targets, and warm-data tiers in tiered-storage architectures. Pro Disk Network maintains the 661-3856 in our enterprise inventory and verifies each unit against manufacturer datasheet specifications prior to listing. New stock ships factory-sealed where available; refurbished units are tested under load before dispatch and ship with a 90-day Pro Disk Network functional warranty. Same-day dispatch on in-stock orders placed before 3pm ET; free standard ground shipping on US orders over $150.
The 661-3856 is a Apple laptop hard drive component with capacity 100 GB, spindle speed 7,200 RPM, form factor 2.5-inch. Pro Disk Network sells the 661-3856 for $449.39 with same-day US shipping and a 30-day return guarantee.
Reviewed By
Reviewed by:Pro Disk Network Engineering Team — . Specifications, compatibility, and pricing for the 661-3856 are shown on this page.
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US-based LLC — 7345 W Sand Lake Rd, STE 210, Office 3208, Orlando, FL 32819
Same-Day US Shipping — orders before 3pm ET ship today via UPS
30-Day Returns — pre-paid label on DOA and defective items
Quick Answer: Will the 661-3856 work with my RAID controller?
The 661-3856 operates with any standard SAS/SATA/NVMe-compatible RAID controller (Dell PERC, HPE Smart Array, LSI/Broadcom MegaRAID, Adaptec, IBM ServeRAID, Lenovo ThinkSystem RAID). Mixing this drive in the same RAID volume with drives of different speed/capacity is supported but never recommended.
How fast does the 661-3856 ship?
661-3856 orders placed before 3 pm ET ship the same business day from US warehouses. Delivery is next business day to most metro ZIPs via FedEx/UPS overnight; ground delivery covers remaining US in 1-4 business days.
The 661-3856 is deployed by US enterprises, MSPs, government, and education customers across multiple infrastructure scenarios. Below are the most common deployment patterns Pro Disk Network sees in real-world orders.
Veeam Backup Repository — Cost-optimised backup target for Veeam B&R, Rubrik, or Cohesity primary backup tier. RAID 6 over 8–24 drives delivers 100+ TB usable per server.
Splunk Warm/Cold Tier — Appropriate for Splunk warm/cold/frozen indexes where ingest write rates are below 200 MB/s per node. Avoid for hot-tier indexes — use NVMe instead.
File Server / SMB Shares — General-purpose Windows Server / Samba shares for departmental file storage. RAID 5 for capacity, RAID 10 for IOPS-sensitive workloads.
Object Storage (Ceph / MinIO) — JBOD presentation behind Ceph OSDs or MinIO erasure-coded pools. Mix with NVMe metadata drives for production object stores.
What is the 661-3856?
The 661-3856 is a Apple enterprise-grade hard drive with capacity 100 GB and spindle speed 7,200 RPM, manufactured by Apple. Pro Disk Network ships this part new and certified-refurbished from our US warehouse with same-day dispatch on orders placed before 3 PM ET, backed by a 30-day return guarantee.
Pros & Cons of 661-3856
Pros
Same-day US shipping from our US warehouse
Cons
Not recommended for OLTP databases above 50 TPS
Mechanical drive — expect 5–10W idle power per unit
3.5" form factor only — confirm caddy fit before ordering
Frequently Asked Questions about 661-3856
Is the 661-3856 a genuine Apple part?
Yes. Pro Disk Network sources every 661-3856 as factory-original Apple inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned Apple servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
Will the 661-3856 work with my RAID controller?
The 661-3856 operates with any standard SAS/SATA/NVMe-compatible RAID controller (Dell PERC, HPE Smart Array, LSI/Broadcom MegaRAID, Adaptec, IBM ServeRAID, Lenovo ThinkSystem RAID). Mixing this drive in the same RAID volume with drives of different speed/capacity is supported but never recommended.
How fast does the 661-3856 ship?
661-3856 orders placed before 3 pm ET ship the same business day from US warehouses. Delivery is next business day to most metro ZIPs via FedEx/UPS overnight; ground delivery covers remaining US in 1-4 business days.
What is the warranty on the 661-3856?
New 661-3856 units carry the full Apple manufacturer warranty (typically 1 to 5 years depending on product line). Refurbished and bulk-OEM units include a Pro Disk Network advance-replacement warranty (90 days refurbished). DOA replacement is free within 30 days of receipt.
Do you offer bulk pricing for the 661-3856?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
Other parts that share the 661 series prefix — useful when sourcing matched lots, hot-spare pools, or capacity-tier expansions.
661-3800 — 661-3800 - Apple 109-Keys USB White Pro Keyboard — $220.91
661-3811 — 661-3811 - Apple Camera Board for iMac G5 17 iSight — $330.07
661-3815 — 661-3815 - Apple 500GB 7200RPM SATA 3Gb/s 3.5-inch Hard Drive — $854.91
661-3816 — 661-3816 - Apple 500GB 7200RPM PATA 3.5-Inch Hard Drive for Xserve RAID A1004 — $944.47
661-3835 — 661-3835 - Apple 256MB nVidia GeForce 7800 GT PCI-Express Video Graphics Card — $382.59
661-3841 — 661-3841 - Apple Inverter Assembly — $242.41
661-3848 — 661-3848 - Apple 160GB 7200RPM SATA 1.5Gb/s 3.5-inch Hard Drive for iMac A1173 — $690.28
661-3849 — 661-3849 - Apple 250GB 7200RPM SATA 1.5Gb/s 3.5-inch Hard Drive for iMac A1173 — $823.14
661-3850 — 661-3850 - Apple 500GB 7200RPM SATA 1.5Gb/s 3.5-inch Hard Drive for iMac A1173 — $165.79
661-3852 — 661-3852 - Apple 8x Slot Load Super Drive for iMac 17 — $616.38
661-3853 — 661-3853 - Apple 80GB 5400RPM SATA 1.5Gb/s 2.5-inch Hard Drive — $471.43
661-3854 — 661-3854 - Apple 100GB 5400RPM SATA 1.5Gb/s 2.5-inch Hard Drive — $491.64
Pro Disk Network Buyer’s Guide: Laptop Hard Drive
How to Pick the Right Drive Capacity for Your Use Case
For VMware vSAN deployments, the 661-3856 is best deployed in the capacity tier with NVMe cache drives in front. Size the cache layer at 10% of usable capacity for write-intensive workloads and 5% for read-leaning workloads. For Veeam backup repositories, plan around 1.5× the size of your protected estate to allow for incremental forever chains plus synthetic fulls. Splunk warm tier sizing should follow the daily ingest rate × retention days × 1.6 compression overhead.
Drive Health Monitoring: SMART, Workload Rating, and Predictive Failure
For VMware ESXi 8 hosts, enable vSphere's predictive-failure analysis on the 661-3856 via the host's storage device list. The host queries SMART on a regular cadence and surfaces yellow/red warnings in vCenter before the drive fails outright. On Linux, use smartctl piped to your monitoring system; on Windows Server, Storage Spaces exposes health state directly in Server Manager.