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Asmcom’s USB Stable Power 5VDC Connector Loom and Major Stock Update. Length of Loom is 200cms
Last updated: 19th April 2026
Our website will remain temporarily offline until
mid-May 2026 while we prepare a significant new inventory release and implement several technical improvements designed to deliver the
best possible performance and reliability from the final generation of Hitachi-LG Data Storage UHD drives.
We are pleased to confirm that we have successfully secured a
large bulk order of Hitachi-LG Data Storage (HLDS) optical drives, including production units dated
September through December 2025. These drives are believed to be among the
final production runs manufactured prior to the official end-of-line (EOL) of these models.
Newly acquired stock includes
Hitachi BP55EB40 –
Revision 4 hardware
Hitachi BU40N –
Revision 4 hardware with updated internal components
The latest
BU40N Revision 4 hardware incorporates refinements to the
internal PCB layout, power regulation and drive control sections. These improvements enhance
mechanical tolerance control and rotational stability, helping to reduce the likelihood of
circular surface marking on certain disc types.
Extensive validation testing
Over the past
months we have been carrying out
extensive real-world testing of host-powered optical drives across a wide range of systems, including
Mac Mini computers, compact PCs, Microsoft Surface devices and other low-power USB platforms.
During testing we deliberately applied
heavy load conditions to the USB subsystem while the optical drives were operating. This included
simultaneous USB device activity such as external hard drive transfers, phone charging, printing, scanning and other bus-powered devices drawing current from the same host controller.
Under these stress conditions we observed that some systems can experience
small but measurable voltage dips on the 5V drive power rail. While these variations are typically within specification, optical drives performing
high-speed UHD reading can be sensitive to such fluctuations, which in certain environments may lead to
occasional read instability or error recovery events.
To further investigate this behaviour we modified several test units and supplied
regulated external 5VDC power directly to the 5V drive power rail. This allowed us to isolate the drive from fluctuations on the host USB bus while maintaining
normal USB data communication.
The results were
extremely positive. With a stable regulated supply connected, the drives demonstrated
excellent voltage stability regardless of USB system load, even when the host ports were heavily stressed with multiple devices. Disc reading performance remained
consistent and predictable, with improved tolerance to demanding workloads. In our testing, this completely eliminated read instability caused by USB power fluctuations on low-power systems such as Mac Mini and Microsoft Surface devices.
This testing confirmed that
stable power delivery can significantly enhance the consistency of host-powered optical drives, particularly when connected to
smaller modern computers where USB power regulation may vary depending on system activity.
Introducing Asmcom’s USB Stable Power 5VDC Connector Loom
To our knowledge, this is the first USB cable specifically engineered to stabilise power delivery for UHD optical drives.
Figure 1: Asmcom’s USB Stable Power 5VDC Connector Loom showing the additional 5VDC female barrel connector for optional regulated external power.
Based on these findings we have developed a new accessory designed specifically to enhance the performance of host-powered optical drives.
Asmcom’s USB Stable Power 5VDC Connector Loom provides the ability to optionally supply
regulated external 5VDC power directly to the drive cable while maintaining
full USB data connectivity.
As shown in
Figure 1, the loom incorporates an additional
5VDC 3.5 mm x 1.35 mm female barrel connector which allows a regulated power supply to stabilise the drive’s power rail while the USB connection continues to handle
data communication with the host system.
The design incorporates:
USB 3.0 Micro-B connection to the drive
USB-A connection for data and host power
Additional 5VDC 3.5 mm x 1.35 mm female barrel connector for optional regulated external power
Additional USB Type A to Type C adaptor will be available for customers with C connectors on their devices
This configuration allows the drive to operate normally from the
USB host while also enabling connection of a
regulated 5VDC 2A power supply when maximum stability is required.
The result is
extremely stable drive operation, even on systems where
USB bus power may fluctuate during heavy device activity.
Because this type of cable
does not currently exist commercially, we have commissioned a
custom tooling production run and are currently having
2,000 units manufactured specifically for use with our host-powered optical drive solutions.
These looms will initially support
USB Micro-B optical drive platforms, and we are also developing
additional versions for other host-powered drive interfaces including native USB Type-C configurations.
Why the website will remain closed until May 2026
We have decided to delay reopening the site so that we can complete:
Final validation testing of the new drive batches Done
Integration of the new USB Stable Power 5VDC Connector Loom Prototype Looms Approved
Preparation of upgraded product kits and documentation Awaiting New Looms
Inventory system updates for the upcoming release Done
Our goal is to ensure that when the website reopens, customers will receive
the most refined and reliable solution possible for these final generation UHD optical drives.
Full availability details and product listings will be published once the site reopens.
Update: We have now received and approved our prototype looms. The stable power USB looms are now being manufactured.
If users have experienced similar read instability on low-power systems, we would be interested to hear your findings.
Thank you for your continued support.
Asmcom
UHD Friendly Drives Team