As a person who has helped a lot of people in a similar situation if those devices are hard drives , remove them from the enclosures . The enclosures are what is holding you back , not the drive inside them . Most people have that old backup LaCie HD With some WD HD inside and don ' t realize you can just pop it in a new case . For single drive enclosures , this takes 5 minutes and has no risk of data loss . Buy some cheap Rosewill USB 3 enclosures on newegg I have bought 2030 of them over the years and install them inside . then plug them directly in to your new Mac with the proper cable maybe you need one of those USBC little fob adapters . This advice isn ' t simple for multidrive enclosures , but it is doable . Use your old Mac as a copystation copy the data off the multidrive device to the old Mac , get a cheap 2 bay enclosure , format the drives , install and resetup the new enclosure to act the way you want RAID 0 or 1 and copy the data back on . You can get a dual drive USB 3 enclosure for 8 TB storage for less than 50 bucks . All the drives are being throttled by FW 800 . Even old SATA 1 drives what would be inside a 2007 hard drive is faster than the 40 MBsec FW 800 limit . A USB 3 enclosure would let them run much closer to their max of 80140 MBsec . Spending $ 30 bucks on some bogstandard USB cases would eliminate your need for FireWire and give you a speed boost . It might be worth the time with a screwdriver .