This case has four external 5 ¼” bays and seven internal 3 ½” bays for hard disk drives. Even though we can see holes on the middle of the 5 ¼” bays for installing screwless retention mechanisms, this case doesn’t come with them. On the other hand, this case comes with several thumbscrews for fastening 5 ¼” devices, so you don’t need to use any tool to install them.

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Figure 10: 5 ¼” bays.

As for the 3 ½” bays, two of them are located between the 5 ¼” cage and the main hard disk drive cage and they don’t use any kind of screwless retention mechanism. The five 3 ½” bays present on the main hard disk drive cage use a screwless mechanism based on rulers that need to be installed on the sides of each drive.

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Figure 11:  3 ½” bays.

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Figure 12: Screwless mechanism.

M59 comes with an adapter for installing up to two 2.5” devices (most likely SSDs) on a 3 ½” bay.

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Figure 13: 2.5” to 3 ½” adapter. It holds up to two 2.5” devices.

In Figure 14, you can see all accessories that come with this case.

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Figure 14: Accessories.