LaCie Power Supply: How to Find the Right Replacement
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LaCie is known for external hard drives with distinctive designs, from the desktop d2 and Big Disk lines to multi-bay 5big storage and the Porsche Design portable drives. Many of the desktop models rely on a separate power adapter, and when that adapter goes missing after a move or a desk clear-out, the drive is useless until you find a matching one. This guide helps you do that safely, and it is honest about which adapters are genuine LaCie parts and which are third-party replacements.
Of the six adapters here, only one is made by LaCie, the ACU057A-0512. The other five are replacements from Metasources, MyVolts and T POWER, each built to match a specific group of LaCie drives by voltage, current and connector.
LaCie Power Supplies Compared
| Adapter | Made by | Output (as listed) | Connector | Listed for |
|---|---|---|---|---|
| 12V 12.5A 150W 4-Pin for LaCie | Metasources | 12V, 12.5A, 150W | 4-pin DIN | 5big models incl. 714111, 9000203, 9000504U |
| 4-Pin DIN 12V 5V AC DC | Metasources | 12V and 5V, 3A listed | Regular 4-pin DIN | d2 Big Disk 300797A, 301199U, 300797U |
| 4-Pin 12V 5V Adapter for LaCie | Metasources | 12V and 5V, 3A listed | Regular 4-pin DIN | 250GB models incl. 300718, 300770, 300790U |
| MyVolts 12V Power Supply | MyVolts | 12V, 0.42A listed | 4-pin mini DIN | Design by F.A. Porsche (old style) |
| LaCie AC Power Supply ACU057A-0512 | LaCie | 5V 4.2A and 12V 3A | Listed as barrel connector | d2, BIGGER, P3 and others |
| T POWER for LaCie AU1361202g | T POWER | 12V, 5A | Barrel connector | Replaces adapter model AU1361202g |
We compared the listings for each adapter, including their compatibility lists and output specifications. We did not test them with drives.
How to Match a LaCie Power Supply
Three things must match. Voltage (V) is the electrical pressure; it must be the same as your drive needs, and many LaCie desktop drives use two voltages at once, 12V for the spinning disk and 5V for the electronics. Current (A) is how much the adapter can supply; a replacement should offer at least as much as the original. Connector is the plug shape: a round 4-pin DIN plug is common on LaCie desktop drives, and there is both a regular and a smaller mini version, which are not interchangeable. The easiest way to be sure is to read the label on the bottom of your drive for its model or part number and compare it with the adapter’s compatibility list.
12V 12.5A 150W 4-Pin for LaCie 5big Storage
Metasources
12V 12.5A 150W 4-Pin for LaCie 71411 5Big 5 Big 9000203 9000504U 9000504AS
Price and specifications are read from the Amazon product page and can change.
12V 12.5A 150W 4-Pin for LaCie
Best for: LaCie 5big multi-bay drive owners
Pros
- 12V 12.5A, 150W output
- 4-pin DIN connector
- OCP, SCP and OVP protection
Cons
- Third-party, not LaCie made
- Listing text shows conflicting amp figure
The 12V 12.5A 150W 4-Pin for LaCie adapter from Metasources is built for LaCie’s multi-bay 5big drives, which need far more power than a single-disk drive. It outputs 12V at 12.5A for 150W through a 4-pin DIN connector, and the listing names compatibility with LaCie part 714111, the 5big Network 2, 5big Thunderbolt 2 (9000504U, 9000504AS), 9000203, 9000462U and 5big Office models. It also lists the original FSP150-AHAN1 power supply as the one it replaces.
It accepts 100 to 240V AC input for use worldwide, and includes overcurrent, short-circuit and overvoltage protection. The listing is FCC approved. One inconsistency: the long listing text includes “1250mA,” which does not match 12.5A. The specifications consistently say 12.5A, so we go by that.
This suits the 5big owner who needs a high-wattage replacement. It is not suitable for single-disk d2 drives, which need a lower-powered dual-voltage adapter.
4-Pin DIN 12V 5V AC DC Adapter for d2 Big Disk
Metasources
4-Pin DIN 12V 5V AC/DC Adapter for LaCie 300797A D2 BigDisk 301199U 300797U
Price and specifications are read from the Amazon product page and can change.
4-Pin DIN 12V 5V AC DC
Best for: d2 Big Disk Extreme owners
Pros
- 12V and 5V output
- Regular 4-pin DIN plug
- 24-month exchange warranty
Cons
- Third-party, not LaCie made
- Not for mini 4-pin sockets
The 4-Pin DIN 12V 5V AC DC adapter, also from Metasources, is designed for LaCie d2 Big Disk and Big Disk Extreme drives, with listed models 300797A, 301199U and 300797U. It supplies both 12V and 5V through a regular-size 4-pin DIN connector. The listing is emphatic that it is the regular big 4-pin plug, not the mini 4-pin, so check your drive’s socket.
It takes 100 to 240V input, includes overcurrent, short-circuit and overvoltage protection, and comes with one AC adapter and one power cord. Metasources backs it with a 24-month exchange warranty. The specifications show a 3A current figure against the 12V output; the 5V current is not listed.
This suits d2 Big Disk owners whose part number appears on the list. If your part number is not there, compare with the next adapter or the genuine LaCie unit.
4-Pin 12V 5V Adapter for Older 250GB LaCie Drives
Best for: Older 250GB LaCie desktop drives
Pros
- 12V and 5V output
- Lists many LaCie part numbers
- 24-month exchange warranty
Cons
- Third-party, not LaCie made
- Not for mini 4-pin sockets
The 4-Pin 12V 5V Adapter for LaCie is Metasources’ version for a different group of older drives. Its list includes the 250GB TB082LL/A, 300718, 300770, 300790U, 300925 and 301199KU. Like the previous adapter, it supplies 12V and 5V through a regular 4-pin DIN plug, not the mini version.
It shares the same 100 to 240V input, protection features, included power cord and 24-month exchange warranty, and weighs 8 ounces. Again, only a 3A figure is listed, against the 12V output.
This suits owners of older 250GB LaCie desktop drives. The easiest way to choose between the two Metasources 12V/5V adapters is simply to find your part number on one of the lists.
MyVolts 12V Power Supply Adaptor for Porsche Design Drives
MyVolts
MyVolts 12V Power Supply Adaptor Compatible with LaCie Design by F.A. Porsche (Old Style) External Hard Drive – US Plug
Price and specifications are read from the Amazon product page and can change.
MyVolts 12V Power Supply Adaptor Compatible
Best for: Old-style Porsche Design drive owners
Pros
- Made for one specific drive
- US 2-pin wall plug
- Over-voltage protection
Cons
- Third-party, not LaCie made
- Spec fields look inconsistent
The MyVolts 12V Power Supply Adaptor Compatible with LaCie Design by F.A. Porsche is a replacement made for one specific drive: the old-style Porsche Design external hard drive. MyVolts says both the power specification and tip size match that drive’s voltage, amperage and connector. It has a US 2-pin wall plug built in and a 4-pin mini DIN connector on the cable.
It includes electrical noise reduction, heat reduction, over-voltage, overcurrent and short-circuit protection, and MyVolts says it meets US safety standards. Some specification fields look odd, listing 12 volts as the input and 0.42A as the current, so rely on the compatibility statement rather than those fields. It weighs 565 g.
This is the pick only if you own the old-style Porsche Design drive. Newer bus-powered portable drives usually draw power over USB and do not need an adapter at all.
LaCie AC Power Supply ACU057A-0512 as the Genuine Part
LaCie
LaCie AC Power Supply ACU057A-0512
Price and specifications are read from the Amazon product page and can change.
LaCie AC Power Supply ACU057A-0512
Best for: Buyers wanting the genuine LaCie adapter
Pros
- Genuine LaCie part
- 5V 4.2A and 12V 3A output
- 100-240V input
Cons
- Connector listed as barrel, confirm plug
- Few compatibility details
The LaCie AC Power Supply ACU057A-0512 is the only adapter in this guide made by LaCie itself, with part number GP-ACU057A-0512. It takes 100 to 240V input at 1.5A and outputs two voltages: 5V at 4.2A and 12V at 3A. The description says it is compatible with LaCie d2, BIGGER, P3 and other external hard drives.
The specifications list its connector as a barrel connector. Because many d2 drives use a round multi-pin socket, please look at your drive’s power socket and the product photos before ordering. The listing does not give a list of exact part numbers, and it weighs 1.2 pounds.
This suits anyone who prefers a genuine LaCie adapter and whose drive matches the listed families.
T POWER for LaCie Model AU1361202g as a Model-Matched Replacement
Best for: Owners of the AU1361202g adapter model
Pros
- 12V 5A output
- 100-240V input
- CE, FCC, RoHS listed
Cons
- Third-party, not LaCie made
- Specific drive models not listed
The T POWER for LaCie Model AU1361202g adapter is a third-party replacement for a specific LaCie adapter model, AU1361202g (RS-300/120-S325). If that model number is printed on your old adapter, this is a direct match. It outputs 12V at 5A through a barrel connector and accepts 100 to 240V input.
T POWER says its products are tested to match or exceed original specifications, and it lists CE, FCC and RoHS standards. It is compact at 4 x 4 x 2 inches and 4 ounces. The listing names the adapter model rather than the drives it powers.
This suits someone who still has the old adapter’s label but lost or broke the adapter itself.
How to Choose the Right LaCie Power Supply
Find your model number. Check the label under the drive, or on the old adapter if you still have it.
Match voltage and connector. Single-voltage 12V drives, dual 12V/5V drives and 5big multi-bay units each need different adapters.
Regular or mini 4-pin. The Metasources 12V/5V adapters are regular size; the MyVolts adapter is mini.
Genuine or replacement. The ACU057A-0512 is LaCie’s own. The rest are third-party replacements.
For keeping a desktop drive running during a power cut, a 3000W portable power station can supply a standard outlet.
If you are planning a wider home backup setup, our guide to backup power for a fridge explains how to size a battery system for larger appliances as well as small electronics.
FAQ
Can I use any 12V adapter on a LaCie drive?
No. Voltage, current and connector must all match, and many LaCie drives need 12V and 5V together.
What is the LaCie ACU057A-0512?
LaCie’s own adapter, outputting 5V 4.2A and 12V 3A.
Which adapter fits a LaCie 5big?
The 12V 12.5A 150W 4-pin adapter lists several 5big models.
What is the difference between regular and mini 4-pin?
They are different sizes and do not fit each other’s sockets.
Are third-party LaCie adapters safe?
The replacements here list overcurrent or overvoltage protection. Match your model number carefully.
