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Faster and Easier!
- The Xpanstor 4 adopts USB 3.2 Gen 2 with a Type-C socket. USB 3.2 Gen 2 transfers files with up to 10 Gbps. The Xpanstor 4 is also backward compatible with ASUSTOR NAS devices that support USB 3.2 Gen 1 and will operate at the 5 Gbps maximum those devices support.
Cool and Quiet
- The internal fan found inside the Xpanstor 4 automatically adjusts its speed according to hard drive temperatures and maintains a balance between sound and performance.
Stable USB Connection
- The Xpanstor 4 has a specially designed USB-C connector and cable. The cable included with your Xpanstor 4 locks in with your expansion unit with two screws on each side of the cable to lock it into the expansion unit to prevent it from being accidentally disconnected. The included USB cable is not proprietary and replaceable, ensuring greater longevity and lower e-waste.
PC-Friendly!
- The Xpanstor 4 works well as a DAS solution as well. Plug an Xpanstor 4 into a computer to access up to four independent drives that can be used by a Windows, Mac or Linux machine for applications that include, but are not limited to storage, drive cloning and diagnostics.
SimmSamm
2025-09-03 15:11:45
Easy to use
scj7129
2025-09-01 21:49:36
I got this as an expansion addition to my Asustor Lockerstor AS6706T (6 bay, 4 occupied, 2 left for spare install.) So far it works pretty well!!! This model is the newest one that Asustor currently offers at the time of this review. The only thing I didn't initially like is the styling...the front cover panel is an angular magnetic snap on panel which really doesn't match the styling of the main unit AS6706T. Other than that the performance seems quite good as it interfaces with the main unit via a USB 3+ connection. I have it configured as BTRFS RAID 5 format which allows 1 disk failure before replacement and rebuild and also allows snapshots which if a file gets deleted I can revert to an earlier date version for recovery. I'm trying to mostly use this volume as a zipped files directory backup for somewhat archival purposes--fingers crossed it will do what I need it to do!!! My main unit I have WD NAS REDs and this unit I have WD Desktop Blues--trying to separate/segregate the drive types per box so I can see how each performs. So far I am able to direct stream with PlexServer/PlexAmp with no issues other than slow network connections. Just a note that setup was decently easy using the ADM Software provided through the Asustor NAS management web portal.
Russ Williams
2025-08-22 13:08:40
The whole point of an expansion unit for a NAS is to provide extra drive bays so that you can have more storage available, but it is only possible to create storage volumes *within* a single unit - either the NAS or the expansion - so you will have separate mounts on your network. You cannot combine the storage between the host NAS and the expansion in any meaningful way.RAID6 is offered by Asustor but essentially worthless as it requires 2 drives out of 4 for parity, and adding these expansion units just means a second(/third/fourth) RAID6 volume wasting half of the space, so if you read the “up to 16 bays†advertising and actually expected to use up to 16 drives as a single volume/mount point, you’ll be disappointed.For the same price as this expansion, you can buy an actual 4-bay NAS (e,g. AS3304T) which will have its own processor/memory/RAID engine and gigabit+ networking, and you will only have the same limitation. It’s not even an independent USB DAS for connection to a computer if the host NAS fails.DO NOT WASTE YOUR MONEY!
Adam Unger
2025-07-21 17:01:14
Impressive DAS for the Austor NAS. This NAS treats it as an extension of the existing system and it is super easy to setup and administer. I set mine up with 4 12TB drives in Raid 6 configuration and it has been super solid.
Kamille Bidan
2025-07-12 15:08:28
This DAS/NAS expansion looks good on paper, but Asustor has some serious quality control issues. The included USB C cable did not work, and I was unable to reach above 40MB/s write speeds with any other USB C cable I had in the house, but I could at least confirm my unit worked. When I placed my unit on a level surface (yes, I measured it with an actual level) only three of the four feet would touch the ground. I knew this was going to be trouble given the unit did not sit level and the vibration of four hard drives was amplified due to this and created unbearable noise. This is my first and last Asustor purchase given such an expensive data appliance failed miserably and is easily surpassed in price and or quality from their competitors.
Jay G
2025-07-01 15:42:06
This is exactly what i needed, my 2-Bay Austor NAS was running out of space, and i had no idea what to do, then i came across this, Asus released this just in time for my needs. It was super easy to set up, and makes my setup a 6 bay NAS now, i have the ability to grow my server when i need, and there was no hit for performance either, what a great device, well made, easy to use. I can't find anything bad to say about this, works great. My unit rested level on the surface it was on, its super silent, my usb cable works great, transfer speeds are excellent, i have often up to 10 friends and family member streaming off of it at a time, and there has been no negative effect on my plex servers peformance, ram or cpu usuage is normal as well using this expansion unit, again this is a fantastic unit, well made & excellent performance. Solid buy. i love it.
Cliente
2025-05-10 16:42:29
Muy fácil de poner en marcha, se conecta, se configura el tipo de RAID y, una vez que ha terminado, a funcionar. Admite mucho almacenamiento y no necesitas otro sistema operativo ya que se maneja desde el principal del Flashstore. Me parece muy buen producto y muy práctico a la hora de añadir almacenamiento. Además combina muy bien estéticamente con el Flashstore.
Tibor
2025-05-07 18:04:38
Ich bin sehr zufrieden mit dem Produkt, Funktioniert einwandfrei mit AS6204T NAS,
Chris
2025-05-01 15:49:46
Simple d'utilisation
David Murray
2025-04-12 18:27:58
Bought this expansion unit to add onto an existing Flashstor. Installed 4 healthy 8tb SATA drives, built a RAID5 volume which was very slow to initialise fully (took over a week, maxed out the SMB processes on the Flashstor). Once fully built, the new volume promptly disappeared. Nothing in the log files, no errors shown. Drives are all fine. Sent the unit back as I didn't want to wait another week for it to try again. Quite disappointed in this expansion unit given how good the Flashstor is.
SimmSamm
2025-04-09 18:21:06
Easy to use
scj7129
2025-04-07 17:30:37
I got this as an expansion addition to my Asustor Lockerstor AS6706T (6 bay, 4 occupied, 2 left for spare install.) So far it works pretty well!!! This model is the newest one that Asustor currently offers at the time of this review. The only thing I didn't initially like is the styling...the front cover panel is an angular magnetic snap on panel which really doesn't match the styling of the main unit AS6706T. Other than that the performance seems quite good as it interfaces with the main unit via a USB 3+ connection. I have it configured as BTRFS RAID 5 format which allows 1 disk failure before replacement and rebuild and also allows snapshots which if a file gets deleted I can revert to an earlier date version for recovery. I'm trying to mostly use this volume as a zipped files directory backup for somewhat archival purposes--fingers crossed it will do what I need it to do!!! My main unit I have WD NAS REDs and this unit I have WD Desktop Blues--trying to separate/segregate the drive types per box so I can see how each performs. So far I am able to direct stream with PlexServer/PlexAmp with no issues other than slow network connections. Just a note that setup was decently easy using the ADM Software provided through the Asustor NAS management web portal.
Russ Williams
2025-03-05 09:58:14
The whole point of an expansion unit for a NAS is to provide extra drive bays so that you can have more storage available, but it is only possible to create storage volumes *within* a single unit - either the NAS or the expansion - so you will have separate mounts on your network. You cannot combine the storage between the host NAS and the expansion in any meaningful way.RAID6 is offered by Asustor but essentially worthless as it requires 2 drives out of 4 for parity, and adding these expansion units just means a second(/third/fourth) RAID6 volume wasting half of the space, so if you read the “up to 16 bays†advertising and actually expected to use up to 16 drives as a single volume/mount point, you’ll be disappointed.For the same price as this expansion, you can buy an actual 4-bay NAS (e,g. AS3304T) which will have its own processor/memory/RAID engine and gigabit+ networking, and you will only have the same limitation. It’s not even an independent USB DAS for connection to a computer if the host NAS fails.DO NOT WASTE YOUR MONEY!
Adam Unger
2025-03-01 14:19:38
Impressive DAS for the Austor NAS. This NAS treats it as an extension of the existing system and it is super easy to setup and administer. I set mine up with 4 12TB drives in Raid 6 configuration and it has been super solid.
Kamille Bidan
2025-01-24 18:23:21
This DAS/NAS expansion looks good on paper, but Asustor has some serious quality control issues. The included USB C cable did not work, and I was unable to reach above 40MB/s write speeds with any other USB C cable I had in the house, but I could at least confirm my unit worked. When I placed my unit on a level surface (yes, I measured it with an actual level) only three of the four feet would touch the ground. I knew this was going to be trouble given the unit did not sit level and the vibration of four hard drives was amplified due to this and created unbearable noise. This is my first and last Asustor purchase given such an expensive data appliance failed miserably and is easily surpassed in price and or quality from their competitors.
Jay G
2025-01-09 12:59:57
This is exactly what i needed, my 2-Bay Austor NAS was running out of space, and i had no idea what to do, then i came across this, Asus released this just in time for my needs. It was super easy to set up, and makes my setup a 6 bay NAS now, i have the ability to grow my server when i need, and there was no hit for performance either, what a great device, well made, easy to use. I can't find anything bad to say about this, works great. My unit rested level on the surface it was on, its super silent, my usb cable works great, transfer speeds are excellent, i have often up to 10 friends and family member streaming off of it at a time, and there has been no negative effect on my plex servers peformance, ram or cpu usuage is normal as well using this expansion unit, again this is a fantastic unit, well made & excellent performance. Solid buy. i love it.
Cliente
2025-01-03 12:48:15
Muy fácil de poner en marcha, se conecta, se configura el tipo de RAID y, una vez que ha terminado, a funcionar. Admite mucho almacenamiento y no necesitas otro sistema operativo ya que se maneja desde el principal del Flashstore. Me parece muy buen producto y muy práctico a la hora de añadir almacenamiento. Además combina muy bien estéticamente con el Flashstore.
Tibor
2024-12-20 16:22:43
Ich bin sehr zufrieden mit dem Produkt, Funktioniert einwandfrei mit AS6204T NAS,
Chris
2024-12-19 11:13:06
Simple d'utilisation
David Murray
2024-12-15 12:23:49
Bought this expansion unit to add onto an existing Flashstor. Installed 4 healthy 8tb SATA drives, built a RAID5 volume which was very slow to initialise fully (took over a week, maxed out the SMB processes on the Flashstor). Once fully built, the new volume promptly disappeared. Nothing in the log files, no errors shown. Drives are all fine. Sent the unit back as I didn't want to wait another week for it to try again. Quite disappointed in this expansion unit given how good the Flashstor is.
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