ICY DOCK
ICY DOCK 5.25” Ext. Bay to 3.5 inch HDD/Device Bay + Ultra Slim ODD Bay Mounting Kit Bracket Adapter | Flex-FIT Duo MB343SPO
Bottom line: The ICY DOCK 5.25” Ext. Bay to 3.5 inch HDD/Device Bay + Ultra Slim ODD ($13.40 on Amazon as of 2026-10-06): Turns one 5.25-inch external bay into two device slots; main trade-off: only fits ultra-slim optical drives, not full-size 5.25-inch ODDs.
As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ Turns one 5.25-inch external bay into two device slots
- ✓ Holds one 3.5-inch HDD or device plus one ultra-slim ODD
- ✓ One-piece frame, no rails or sub-assemblies to put together
- ✓ Pre-drilled screw holes for both the 3.5-inch device and the slim ODD
- ✓ Includes a 6-pin slimline to 15-pin SATA power cable
Cons
- ✗ Only fits ultra-slim optical drives, not full-size 5.25-inch ODDs
- ✗ Room for only one 3.5-inch device per bracket
- ✗ Needs a free external 5.25-inch bay, so it's no use in bayless cases
- ✗ Screw-mounted drives, no tool-less or hot-swap trays
Manufacturer description
The ICY DOCK Flex-FIT Duo MB343SPO bay adapter fits two devices into a single 5.25-inch external drive bay. It gives you room for one 3.5-inch device or hard drive and one ultra-slim optical drive. If your case has a spare 5.25-inch bay but you no longer want a full-size optical drive, this bracket lets you reuse that space. Install a 3.5-inch HDD, card reader or other 3.5-inch device, and still keep a slim disc drive for installing older software or ripping media. The bracket is a single lightweight piece, so you don't assemble any rails or sub-frames. It works with any standard 5.25-inch…
SpecPicks Verdict
SpecPicks scored ICY DOCK 5.25” Ext. Bay to 3.5 inch HDD/Device Bay + Ultra Slim ODD… using a rating × review-volume × price-fit model applied to published specs and reviews across the retro cases & modding category. ICY DOCK's retro cases & modding lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for retro cases & modding of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Will the ICY DOCK MB343SPO fit my PC case?
It fits any standard 5.25-inch external drive bay. If your case has an open 5.25-inch front bay, the Flex-FIT Duo mounts in it like a regular optical drive.
What drives can I install in it?
It holds one 3.5-inch device or hard drive and one ultra-slim optical disc drive (ODD) at the same time. Mounting screw holes are provided for both.
Can I use a regular full-size DVD or Blu-ray drive in it?
No. The optical slot is sized for ultra-slim ODDs, like the ones used in laptops. A full-size 5.25-inch optical drive needs its own 5.25-inch bay.
Does it come with a power cable for the slim optical drive?
Yes. It includes a 6-pin slimline to 15-pin SATA power cable, so you can power the slim ODD from a standard SATA power connector on your PSU. Check the product listing to see whether data cables are included.
What warranty does the ICY DOCK Flex-FIT Duo have?
Warranty terms aren't given in the product details. Check the product listing or ICY DOCK's website for current warranty coverage.
Key Features
- Durable one piece, lightweight construction
- Compatible with any standard 5.25” external drive bay
- Fits 1 x 3.5” device / hard drive and 1 x Ultra-Slim ODD
- Mounting screw holes for 3.5” HDD and Ultra-Slim ODD installation
- 6 pin Slimline to 15 pin SATA power cable included
Full Specifications
| Brand | ICY DOCK |
|---|---|
| Color | 3.5" + ODD |
| Unit Count | 1.0 Count |
| Model Number | MB343SPO |
| Built-In Media | 1 x 5.25 inch adapter |
| Mfr Part Number | MB343SPO |
| Hardware Platform | PC |
| Compatible Devices | Laptop |
| Enclosure Material | Metal |
| Hardware Interface | USB 3.0 |
| Hard Disk Form Factor | 3.5 Inches |
| Connectivity Technology | SATA |
| Item Dimensions L x W x H | 5.87"L x 5.75"W x 1.61"H |
| Supported Devices Quantity | 1 |
| Global Trade Identification Number | 00884826504849, 04711132867336 |
Ready to buy?
ICY DOCK 5.25” Ext. Bay to 3.5 inch HDD/Device Bay + Ultra Slim ODD Bay Mounting Kit Bracket Adapter | Flex-FIT Duo MB343SPO is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Related Retro Cases & Modding
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
- Best Retro Handhelds in 2026 — From $35 to $500
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
- How to Build a Windows 98 Retro PC in 2026
- Best Budget Gaming PC Build 2026 — ~$1,000 ($800 on Sale)
- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
- Best 1440p Gaming GPUs in 2026
More reviews from the SpecPicks archive
Browse all reviews →- Raspberry Pi 4 8GB as a Low-Power Quake 3 / OpenArena / UT99 Dedicated Server (2026 Build Log)
- Expanding the SNES Classic and Genesis Mini Library in 2026
- Can a Raspberry Pi 4 8GB Run Local LLMs in 2026?
- AMD Ryzen AI Max+ PRO 495 192GB: What the PassMark Leak Tells Us
- Best CPU Cooler for Intel Core i7/i9 Builds in 2026
- Ryzen 5 5600G vs Ryzen 7 5700X for a Budget LLM + Gaming Build
- llama.cpp on a 12GB RTX 3060: llama-bench Setup and Measured tok/s
- Qwen3.6-27B on Dual RTX 3060 12GB: The $400 30-50 tok/s Local LLM Build
- GPT-5.5 Instant Got a Readability Upgrade — Can a Local RTX 3060 Match It?
- Best Budget Gaming PC Parts in 2026: A 5-Pick Build List
- Best PC Upgrades to Buy Before the 2026 Memory Price Spike
- Gemini Intelligence Hardware Requirements: What Google's Stack Tells Us About Local Inference
- Best CPU Cooler for the Ryzen 7 5800X: Air vs 120mm vs 240mm AIO
- Logitech G920 vs HORI Racing Wheel: Best Starter Sim Wheel in 2026
- Best GPU for Ryzen 5 5500 in 2026 (Budget to 1440p)
- Best Retro Gaming Consoles and Controllers to Buy in 2026
- i7-9700K vs Ryzen 7 5800X as a CPU-Offload Host for a 12GB GPU
- IBM Granite 4.1 8B vs Qwen 3.6 27B: Which Small Local Model Wins on a 16GB GPU?
- Mistral Medium 3.5 Hardware Requirements: 128B Dense, 78 GB at Q4
- Ollama vs llama.cpp for Qwen 3.6 27B on a 12GB RTX 3060
- Voodoo 3 3500 TV vs GeForce 256 DDR: The Last Great 1999 Gaming GPU Showdown
- Best Streaming & Content-Creation Starter Kit in 2026
- Best Gaming Monitor for 2026: 5 Picks from 1440p to 4K
- Best Budget SATA SSD for 2026 Builds
Earliest SpecPicks reviews
Browse full archive →- Best GPU for Llama 3.1 8B (2026)
- Best GPU for Qwen 3 14B (2026)
- Best GPU for Qwen 3 32B (2026)
- Best GPU for Llama 3.1 70B (2026)
- Best GPU for DeepSeek-R1 32B (2026)
- Best GPU for Llama 3.1 405B (2026)
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 14B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 70B on NVIDIA GeForce RTX 5090
- How to run DeepSeek-R1 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 4090