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  • COVERAGE: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one.
  • EASY CLAIMS PROCESS: File a claim anytime online at www.Asurion.com/Amazon or by phone. Most claims approved within minutes. If we can’t repair it, we’ll send you an Amazon.com Gift Card for the purchase price of your covered product or replace it.
  • EXPERT TECH HELP: Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
  • MORE DETAILS: Additional information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase (if you do not see this email, please check your spam folder). Contact us if you cannot locate your plan confirmation and Terms & Conditions via email at AmazonFeedback@Asurion.com.
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4 Year Office Equipment Protection Plan

from Asurion, LLC
  • NO ADDITIONAL COST: You pay $0 for repairs – parts, labor and shipping included.
  • COVERAGE: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one.
  • EASY CLAIMS PROCESS: File a claim anytime online at www.Asurion.com/Amazon or by phone. Most claims approved within minutes. If we can’t repair it, we’ll send you an Amazon.com Gift Card for the purchase price of your covered product or replace it.
  • EXPERT TECH HELP: Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
  • MORE DETAILS: Additional information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase (if you do not see this email, please check your spam folder). Contact us if you cannot locate your plan confirmation and Terms & Conditions via email at AmazonFeedback@Asurion.com.

Asurion Tech Unlimited Protection Plan with Tech Support – breakdown coverage for desktops, TVs, gaming devices, and more plus accident protection for portable electronics like laptops, tablets, and headphones

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  • UNLIMITED DEVICES (EXCLUDES MOBILE PHONES): Covers electronic purchases made on Amazon in the past two years from enrollment plus future Amazon purchases including computers, tablets, TVs, office devices, gaming consoles, headphones, cameras, connected devices, home theater electronics, Amazon devices and more.
  • CLAIM LIMIT & FEES: $3,000/12-month period claim limit for the total cost of all repairs, replacements and reimbursements across all claims. If we can’t repair it, we’ll send an Amazon e-gift card or replace the device. A $99 service fee will apply to claims on products with a purchase price of $500 and up.
  • WE’VE GOT YOU COVERED: Plan begins 30 days after enrollment and covers mechanical and electrical malfunctions, regardless of the manufacturer's warranty. Plus drops, spills and cracked screens during normal use for portable devices.
  • EXPERT TECH HELP: Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and more.
  • LOW MONTHLY BILLING: $16.99 plus tax billed monthly, cancel anytime. THIS PROGRAM IS MONTH-TO-MONTH AND WILL CONTINUE UNTIL CANCELLED. Coverage for all products ends 30 days after plan is cancelled.
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Synology 5bay Expansion Unit DX517 (Diskless)

4.7 out of 5 stars 348 ratings

$563.87

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About this item

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  • Online volume expansion
  • Dedicated local backup solution
  • Hot-swappable drive tray design
  • Synchronized system operation with Disk Station. Screwless drive tray design reduces the time needed for system setup
  • Applied models: DS1817+, DS1517+, DS1817, DS1517. Compatible Drive Type-3.5 inch SATA HDD, 2.5 inch SATA HDD, 2.5 inch SATA SSD. Note- It is strongly recommended that you only install drives listed on your device's compatibility list. Storage pool and volume creation processes may fail when using unverified drives

Frequently bought together

  • Synology 5bay Expansion Unit DX517 (Diskless)
  • +
  • Seagate IronWolf Pro 16TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6GB/S 7200 RPM 256MB Cache for Raid Network Attache
  • +
  • Synology 8 Bay DiskStation DS1821+ (Diskless), 8-bay; 4gb ddr4
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Product Description

Synology DX517 Drive Enclosure Serial ATA - eSATA Host Interface External

What's in the box

  • DX517 main unit
  • User Guide
  • Accessory pack
  • Expansion cable
  • AC power cord
  • Compare with similar items


    Synology 5bay Expansion Unit DX517 (Diskless)
    Synology 4 bay NAS DiskStation DS920+ (Diskless), 4-bay; 4GB DDR4
    Synology NAS DiskStation DS1520+ (Diskless), 5-Bay; 8GB DDR4
    Synology 4 bay NAS DiskStation DS418 (Diskless)
    Synology 6 bay NAS DiskStation DS1621+ (Diskless)
    QNAP TS-932PX-4G 5+4 Bay High-Speed NAS with Two 10GbE and 2.5GbE Ports
    Customer Rating 4.7 out of 5 stars (348) 4.8 out of 5 stars (6604) 4.9 out of 5 stars (540) 4.7 out of 5 stars (1907) 4.8 out of 5 stars (292) 4.6 out of 5 stars (143)
    Price $563.87 $602.94 $845.64 $369.99 $953.98 $641.99
    Sold By The Factory Depot Amazon.com Triplenet Pricing INC Amazon.com Adorama Amazon.com
    Compatible Devices Desktop Smartphone, Television, Laptop, Desktop, Camera Desktop
    Hard Disk Size 1 4 GB 40.0 TB 0
    Hardware Interface eSATA USB 3.0, Ethernet, SATA 6.0 Gb/s PCI Express x16 USB 3.0 Solid State Drive USB, SATA 6.0 Gb/s
    Item Dimensions 9.76 x 9.17 x 6.18 inches 8.78 x 7.83 x 6.54 inches 12.5 x 11.8 x 11.6 inches 8.78 x 7.83 x 6.54 inches 9.57 x 11.1 x 6.54 inches 11 x 11 x 11 inches
    Item Weight 8.62 lbs 8.02 lbs 9.80 lbs 5.03 lbs 11.24 lbs 7.90 lbs

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    Warranty & Support

    Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
    Product Warranty: For warranty information about this product, please click here

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    Customer reviews

    4.7 out of 5 stars
    4.7 out of 5
    348 global ratings

    Top reviews from the United States

    Reviewed in the United States 🇺🇸 on December 17, 2019
    46 people found this helpful
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    Reviewed in the United States 🇺🇸 on September 7, 2022
    10 people found this helpful
    Report abuse
    Reviewed in the United States 🇺🇸 on October 11, 2022
    2 people found this helpful
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    Reviewed in the United States 🇺🇸 on October 25, 2017
    Customer image
    5.0 out of 5 stars Joining to my DS918+
    By Rock Edge on October 24, 2017
    I recently installed a DS918+ and have been very impressed with the speed, management tools and Plex performance. Having migrated off an older NAS, I had hard drives laying around, so logically I needed this!

    The retail packaging with handle came inside a Synology type warehouse box fully taped and that was nested inside a larger Zon box with a ton of paper packing around it. Nicely done there.

    Set up was easy. The cable is custom for the Synology connectors and only about 18 inches long, so you need to store them alongside or very close to each other. I have them on separate shelves on a wire rack vertically and it reaches fine (hopefully the pic is approved for your review).

    Similar to my DS918+ review, the unit is very light until you put drives into it, but it's not a cheap feel. This one has distributed lights over each bay. The master NAS has lights running down the side. I may need to hit the forums to see if I can mute or turn those off. The drive trays are spring loaded and only took just a few minutes to mount a couple of disks. When re-inserting the tray into the NAS, be sure to not have the spring loaded cover already pressed, it won’t fit snugly nor mount the drive properly. No danger here just have to click it out and slide it in then lock it in place. Power it up.

    Once attached to a supported NAS device for management, you go to that units web interface. I didn’t have to take any action, but could see from the dash board on the ‘desktop’ admin tool that it had additional drives available. So I launched Storage Manager right away. On my base NAS I created a straight Raid 5 volume. For this set of disks, I'm testing "Disk Group" running SHR, Synology's proprietary raid solution. The biggest thing you can get out of SHR over a typical raid with single disk protection is you can keep adding hard drives. Since this is 5 bays, I started with 3 4TB drives and the usable space is about 7.4 TB. After I move some data around, I'll add another 4TB and expect right at 11 total... then test adding another drive and will report back here the result. Please note if the drives are of varied sizes, my understanding is that it will round down to the lowest drive size. So 1 4TB and 1 2TB SHR’d would be the same as 2 2TB drives. Plenty of cool YouTube vids to explain better for you.
    After you create your disk group, you go to the Volume tab and do a “Create” from the menu up top. Next you’ll want to see that storage right away (it’s doing a disk check but the space is usable rather quickly). Launch File Manager and create a new share. Set up the name, security all that and you are ready to rock.

    I’ve got a lot of juggling to do but will do some speed tests soon. So far Volume to Volume tests seem really fast which is great, but not sure that will be the primary access use case.
    Check out the DS918+ reviews on the user interface and positives there. Over all I am very pleased with the expansion.
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    59 people found this helpful
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    Reviewed in the United States 🇺🇸 on July 31, 2022
    Customer image
    5.0 out of 5 stars WILL GET THE JOB DONE
    By Rick L. Sprinkle on July 31, 2022
    I needed the additional storage for my collection of cult movies many which are rare. This expansion box was filled with 3 x 10TB Seagate NAS Drives and 2 x 16TB NAS Drives. Excellent performance running off of my Synology DS920+. Happy customer in Ohio.
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    4 people found this helpful
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    Top reviews from other countries

    M. Chambers
    5.0 out of 5 stars Good Stuff...
    Reviewed in the United Kingdom 🇬🇧 on May 1, 2019
    Customer image
    5.0 out of 5 stars Good Stuff...
    Reviewed in the United Kingdom 🇬🇧 on May 1, 2019
    A solid and sturdy chunk of engineering. Very well packaged, no instructions to speak of but then it is the Synology way to rely 100% on web based documentation. It took literally five minutes to mount five 3.5" disks into the screwless mounting trays (screws are provided in the event you have older/nonstandard disks). I connected it to my DS918+ using a very secure screwed eSATA cable - this short cable assumes you will site the DX517 extension bay next to the DS. I was unsure from the Synology site that the DX517 was compatible with the DS918+ so contacted the retailer, box.co.uk who supplied this via Amazon, for confirmation and they replied within a few hours in the affirmative which was great. This DS is still configuring the disks which I think will take about 20 hours. The image is of the DX 517 adjacent to the DS. Overall I'm very pleased with this product.
    Images in this review
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    Customer image
    21 people found this helpful
    Report abuse
    Mr. B. S. Cottee
    5.0 out of 5 stars Useful add on but with a slight design flaw
    Reviewed in the United Kingdom 🇬🇧 on June 26, 2020
    8 people found this helpful
    Report abuse
    Mr. G. Tomlinson
    4.0 out of 5 stars Great device a shame about the included sata cable
    Reviewed in the United Kingdom 🇬🇧 on February 5, 2022
    2 people found this helpful
    Report abuse
    Razor
    5.0 out of 5 stars Easy to install... and no operational drawbacks
    Reviewed in the United Kingdom 🇬🇧 on May 4, 2020
    7 people found this helpful
    Report abuse
    Savvas Sidiropoulos
    1.0 out of 5 stars Do you need one? - No you don't
    Reviewed in Germany 🇩🇪 on August 27, 2020
    19 people found this helpful
    Report abuse