The interior of the SilverStone SETA D1 looks pretty traditional with a solid metal shroud on the bottom to hide your PSU and 3.5" storage drives. It also features a few cutouts, including an opening through which you may easily route the PCIe power leads. When we reviewed the H1, we noted that the chassis could benefit from additional storage trays and looking at the D1, is now clear why SilverStone chose not to do so. SilverStone always intended to have this variant of the chassis as a storage focused SKU. Out of the box, the chassis is set up for four such drives as well as two external 5.25" bays. However, thanks to the included accessories, you may opt to maximize either format by filling it up with individual trays or making room for the second 5.25" bracket instead. You can also clearly see the four grommets covering the major cable-routing holes around the motherboard section.
Besides the four grommets, SilverStone has omitted the one at the top left corner, as this section is hidden by the 5.25" bays anyways. The whole front area is tooled for those individual hard drive trays and while all openings are visible, you could simply clip in the supplied covers to make them disappear from view, SilverStone has re-purposed the area to allow for the largest motherboards. There are also two classic 2.5" hard-drive mounting plates below the large CPU cooler backplate opening of the tray.
In the front, at the bottom, is a fairly tall 3.5" hard-drive cage. While tall, it may only hold two drives. I wonder if SilverStone could have squeezed three in—it sure feels like it. Above that are the two previously mentioned 140 mm intake fans, hidden behind the hard drive tray and that pre-installed dual-slot 5.25" bracket.
In the rear, starting at the bottom, is the large PSU bay, which can easily hold a PSU of up to 225 mm in length—ample room for high-capacity units, it further underlines the target audience of heavy duty professional users. Above that, the 7+2 expansion slots come with individual, reusable covers. Each is held in place by domed screws, which is a little departure from the classic hexagonal case screws or thumb screws we have seen in the past. In the very top is that third 140 mm fan, which comes with a 3-pin connector just like the two in the front. Nowadays, fans that do not sport ARGB tend to opt for PWM for these type of cases; unfortunately, those within the SETA D1 are not, even though SilverStone did opt for different, simpler fan models than those seen in the Q1 or H1, which meant they could have gone for PWM but again chose not to.
Taking a peek at the ceiling, there is heaps of space for an AIO of classic thickness. You won't have to worry about it interfering with your motherboard in any way.
All the leads within the SilverStone SETA D1 are sleeved black. Noteworthy is that all of them utilize flat cables, which makes for easier cable routing.