1.1 System Requirements
- Mac: macOS 10.13.6 or later
- PC: Windows 10 or later
- Any Mac or PC with a compatible PCIe slot
- PCIe 3.0 or greater strongly recommended
- Lanes: x8 or greater strongly recommended
- Physical: x8 or greater required
- No driver is required for the Accelsior 4M2 itself but some M.2 drives may require one. Please review the drive manufacturer’s requirements before installing.
- Any PCIe based M.2 SSD with an M-key connector
- 2280 form factor required
1.2 Package Contents
- (1) OWC Accelsior 4M2
- (1) 3-Year or 1-Year SoftRAID XT Upgrade and Support Plan (based on purchase)
- (1) SoftRAID License (see back of the OWC Accelsior 4M2)
1.3 About This Manual
The images and descriptions may vary slightly between this manual and the unit shipped. Functions and features may change depending on the firmware version. The latest product details and warranty information can be found on the product web page. OWC’s Limited Warranty is not transferable and subject to limitations.
General Use Precautions
- Read this user guide carefully and follow all recommended usage steps and precautions.
- To avoid damage, do not expose the device to temperatures outside the following ranges:
- Environmental (Operating)
- Temperature (ºF): 41º — 95º
- Temperature (ºC): 5º — 35º
- Environmental (Non-Operating)
- Temperature (ºF): -4º — 140º
- Temperature (ºC): -20º — 60º
- Environmental (Operating)
- Always unplug the device from the electrical outlet if there is a risk of lightning or if it will be unused for an extended period of time. Otherwise, there is an increased risk of electrical shock, short-circuiting or fire.
- Do not use the device near other electrical appliances such as televisions, radios or speakers. Doing so may cause interference which will adversely affect the operation of the other products.
- Protect your device from excessive exposure to dust during use or storage. Dust can build up inside the device, increasing the risk of damage or malfunction.
- Do not block any ventilation openings on the device. These help to keep the device cool during operation. Blocking the ventilation openings may cause damage to the device and cause an increased risk of short circuiting or fire.
- Read this user guide carefully and follow the recommended steps for assembly.
- Use proper anti-static precautions while installing drives into this enclosure. Failure to do so can cause damage to your drive mechanisms and/or the enclosure.
- Do not attempt to disassemble or modify the device. To avoid any risk of electrical shock, fire, short-circuiting or dangerous emissions, never insert any metallic object into the device. If it appears to be malfunctioning, please contact technical support.
- Never expose your device to rain, or use it near water or in damp or wet conditions. Never place objects containing liquids on the drive, as they may spill into its openings. Doing so increases the risk of electrical shock, short-circuiting, fire or personal injury.
1.4 Side View
A. Status LEDs - Power On = Solid Green / Disk Activity = Flashing Green
B. PCIe Slot Cover
C. PCIe connector – align this part of the device with a compatible PCIe slot on the host computer or enclosure.
2.1 Device Setup
This section describes the process of setting up the OWC Accelsior 4M2 if purchased with pre-installed drives.
NOTE: The OWC Accelsior 4M2 is susceptible to invisible damage if not protected during installation. For proper grounding, we recommend using a grounding strap. Work in a clean, static-free area, and avoid wearing clothing that retains static charges. For more information regarding anti-static protection, please review the support article "Discharging Static Electricity".
1. Disconnect all power and powered devices from your host or PCIe enclosure. Open the host or enclosure so the compatible PCIe slot(s) are visible and accessible. NOTE: The OWC Accelsior 4M2 will only physically fit into a 8x / 16x PCIe slot. Consult your host or enclosure manual to determine the PCIe slot location and physical size.
2. Align the PCIe connector of the OWC Accelsior 4M2 SSD with the compatible slot on your host as highlighted. Carefully seat the drive into the slot. If there is resistance, do not force the drive into the slot. Remove the drive, re-align the connector, and try again.
3. Once the drive is fully seated affix the included screw to the bracket.
4. The OWC Accelsior 4M2 is configured as a SoftRAID XT RAID. Downloading and installing the latest version of SoftRAID XT is recommended to experience the best performance.
NOTE: OWC Accelsior 4M2 devices purchased with pre-installed drives come bundled with a "3-Year SoftRAID XT Upgrade and Support Plan". More information pertaining to the bundled SoftRAID XT Upgrade and Support Plan can be viewed by visiting: go.owc.com/softraid
Mac SoftRAID XT Setup
Windows SoftRAID XT Setup
- If you are using the OWC Mercury Elite Pro Quad with a Windows PC, the pre-installed drives need to be reconfigured before they can be used. Please consult the "Mac to Windows – SoftRAID XT Volume Conversation" guide by visiting go.owc.com/softraid/convert-ntfs.
2.2 Assembly Steps
This section describes the process of installing drives into the OWC Accelsior 4M2 if purchased as a bare enclosure. For maximum performance install four identical SSDs, then configure them as a RAID 0 using SoftRAID XT.
NOTE: OWC Accelsior 4M2 devices purchased with pre-installed drives come bundled with a "1-Year SoftRAID XT Upgrade and Support Plan". More information pertaining to the bundled SoftRAID XT Upgrade and Support Plan can be viewed by visiting: go.owc.com/softraid
NOTE: before installing the assembled OWC Accelsior 4M2 in a host, write down the SoftRAID XT serial number listed on the back of the OWC Accelsior 4M2. The serial number is required for installing and operating SoftRAID XT.
1. Remove the OWC Accelsior 4M2 from the packaging and set it on a flat work surface with the bracket facing forwards. Remove the highlighted screw using a Torx T8 driver (not included).
2. Carefully flip the OWC Accelsior 4M2 over and remove the four highlighted T8 screws to loosen the connection from the heat sink. Set the screws aside securing the OWC Accelsior 4M2 later during assembly.
3. Carefully separate the PCIe card from the black heat sink like opening a book. Don’t apply extra force to separate the card and heat sink if resistance is experienced. Keep being patient and the card will separate from the heat sink.
4. Flip the OWC Accelsior 4M2 over to reveal and position the M.2 connectors upwards. Remove the four highlighted screws with a Phillips 00 driver (not included). Set the screws aside securing the OWC Accelsior 4M2 later during assembly.
5. Carefully align the first M.2 drive to the PCIe board connector (5a) and slide it forward until it snaps into place. Only a modest amount of force is required; do not force the drive if it does not snap into place. Re-align it and try again. Once the drive is seated use one of the screws from Step 4 to secure the drive (5b); you may need to hold the drive down initially until you thread the screw onto the post. Repeat this process for each M.2 drive you intend to install. (5c) shows all four drives installed.
6. Set the heat sink in front of you, then rotate the PCIe card so that the drives will align with the thermal pad (6a). Next carefully set the PCIe card down on the heat sink so that the four screw holes on the PCIe card are over the corresponding holes on the heat sink (6b). You may need to apply light downward pressure to the PCBa to ensure the pieces fit flush.
7. Re-affix the four T8 screws that you removed in Step 2. If one or more of the screws does not fasten or does so at a slight angle, don’t apply extra force; the two components may not be fully aligned. Remove the screw(s) then re-check the applicable screw hole(s) on the PCBA to make sure you can see through to the corresponding holes on the heat sink then try again
8. Turn the card over with the PCIe bracket facing you and re-affix the T8 screw that was removed in Step 1. Once complete the card is ready to install into the host computer (see below)
9. Align the PCIe connector of the OWC Accelsior 4M2 SSD with the compatible slot on your host as highlighted. Carefully seat the drive into the slot. If there is resistance, do not force the drive into the slot. Remove the drive, re-align the connector, and try again.
10. Once the drive is fully seated affix the included screw to the bracket.
11. The installed drives are ready to be formatted. Move onto Section 2.3 “RAID Configuration Options” for instructions on how to format and configure the RAID Mode of the OWC Mercury Elite Pro Quad.
2.3 Raid Configuration Options
SoftRAID XT Raid Configuration
- Downloading and installing the latest version of SoftRAID XT is recommended to experience the best performance from the OWC Accelsior 4M2.
NOTE: OWC OWC Accelsior 4M2 devices purchased with pre-installed drives come bundled with a "3-Year SoftRAID XT Upgrade and Support Plan". OWC OWC Accelsior 4M2 devices purchased as a bare enclosure come bundled with a “1-Year SoftRAID XT Upgrade and Support Plan”. More information pertaining to the bundled SoftRAID XT Upgrade and Support Plan can be viewed by visiting: go.owc.com/softraid
- SoftRAID will assist with formatting the installed drives and setting up a RAID volume.
Mac SoftRAID XT Setup
Windows SoftRAID XT Setup
- If you are using the OWC OWC Accelsior 4M2 with a Windows PC, the pre-installed drives need to be reconfigured before the card can be used. Please consult the Mac to Windows – SoftRAID XT Volume Conversation guide by visiting go.owc.com/softraid/convert-ntfs.
- The OWC OWC Accelsior 4M2 can be formatted and configured using the Mac operating system through Disk Utility If SoftRAID isn’t desired.
Mac Raid Configurator
- Open the “Disk Utility” application on your Mac.
- Choose “File” and select “RAID Assistant”.
- Select a set type:
- Striped (RAID 0) set: A striped RAID set can speed up access to your data. You can’t create a RAID set on your startup disk; you must first start up your computer from another disk.
- Mirrored (RAID 1) set: Protect your data against hardware failure with a mirrored RAID set. When you create a mirrored RAID set, your data is written to multiple disks so the information is stored redundantly. You can’t create a RAID set on your startup disk; you must first start up your computer from another disk.
- Concatenated (JBOD) set: Increase storage space with a concatenated disk set. If you need one large disk, but you have several smaller disks, you can create a concatenated disk set to use as one large disk.
- Select the checkboxes of the disks you want to include in the set.
- For each disk, click the pop-up menu in the Role column and choose “RAID slice” or “Spare” to designate the disk as a standard member or spare in the set, then click Next.
- Enter a name for the RAID set in the RAID Name field.
- Click the Format pop-up menu, then choose a volume format that you want for all the disks in the set. (See File system formats available in Disk Utility.)
- Click the “Chunk size” pop-up menu, then choose a disk chunk size that you want used for all the disks.
- When you create a striped set, chunks of data from the same file are distributed across the drives. Ideally, you want data distributed across drives evenly and at an optimum size so that it can be efficiently accessed. If you want high data throughput from your set, choose a smaller chunk size so that data is spread across the drives and one drive can be accessing data while another is seeking the next chunk. With mirrored disk sets, choose a chunk size that matches the data you’re accessing. For example, when working with video files, your Mac is accessing large chunks of data, whereas when using a database of many small records, your disks may be accessing smaller chunks of information.
- If you are creating a mirrored RAID set, select the “Automatically rebuild” checkbox to allow the set to be automatically rebuilt when member disks are reconnected
- Click "Create" and then click "Done".
3.1 Usage Notes
- Before installing this product in a host device, write down the SoftRAID XT serial number that is listed on the back of the OWC Accelsior 4M2 before installation into a host. The SoftRAID XT serial number is required for installation and operation of SoftRAID XT
- Data transfer rates will vary based on SSDs used, CPU speed, RAID setting, and PCIe version.
- Backward compatible with PCIe 2.0 slots with reduced speeds.
- Performance in a Thunderbolt 3 PCIe expansion chassis limited by maximum Thunderbolt 3 PCIe bandwidth of 2800MB/s.
- Bootable using a single, independent M.2 startup disk, with the other three M.2 SSDs configured as independent volumes or as a software RAID (SoftRAID or Apple RAID). Mac Pro (2010-2012) requires macOS 10.14.6. Mac Pro (2019) requires macOS 10.15.1 or later.
- When installed, the following SSDs will only be compatible with Windows 10 systems: Hynix Gold P31, Samsung PM981a.
- The LED function of this product will be disabled and not function if used with an 8TB OWC Aura Ultra IV MVMe M.2 SSD (OWCP4U8T1PT08).
- Many problems can be traced back to an improperly seated M.2 drive (0GB models only) or PCIe card, or host compatibility issues (e.g. installing the card in a slower PCIe 2.0 slot or a PCIe 3.x slot with too few data lanes to support the desired performance, or installed in a computer running an older version of Windows or macOS). Make sure that the M.2 drives (0GB only) and/or the PCIe card is seated properly and that the computer is configured to meet the system requirements. If everything is installed normally and you’re still having trouble, please contact technical support.
- Depending on date of purchase, certain GPU-related limitations may apply when installing the Accelsior 4M2 into the 2010–2012 Mac Pro.
4.2 About Data Backup
To ensure that your files are protected and to prevent data loss, we strongly suggest that you keep two copies of your data: one copy on your OWC Accelsior 4M2 and a second copy on your internal drive or another storage medium, such as an optical backup, or on a second external storage unit. Any data loss or corruption while using the enclosure is the sole responsibility of the user, and under no circumstances may OWC, its parent, partners, affiliates, officers, employees, or agents be held liable for loss of the use of data including compensation of any kind or recovery of the data.
4.3 Contacting Support
Terms and Conditions of Sale
The OWC Accelsior 4M2 has a 5 Year OWC Limited Warranty if it was bundled with drives. OWC Accelsior 4M2’s that do not ship with drives have a 3 Year OWC Limited Warranty. For up-to-date product and warranty information, please visit the product web page.
The material in this document is for information purposes only and subject to change without notice. While reasonable efforts have been made in the preparation of this document to assure its accuracy, OWC, its parent, partners, affiliates, officers, employees, and agents assume no liability resulting from errors or omissions in this document, or from the use of the information contained herein. OWC reserves the right to make changes or revisions in the product design or the product manual without reservation and without obligation to notify any person of such revisions and changes.
Warning! Modifications not authorized by the manufacturer may void the user’s authority to operate this device.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference with radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
Copyrights and Trademarks
No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of OWC.
© 2023 Other World Computing, Inc. All rights reserved. OWC and the OWC logo are trademarks of New Concepts Development Corporation, registered in the U.S. and/or other countries. Accelsior is a trademark of New Concepts Development Corporation. Mac and macOS are trademarks of Apple Inc., registered in the U.S. and other countries. Other marks may be the trademark or registered trademark property of their owners.
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