A drive bay is a standard area for adding hardware to a computer. Most drive bays are fixed to the inside of a case, but some can be removed.
DELL DXD9H drive bay panel 2.5

DELL DXD9H drive bay panel 2.5" Carrier panel Silver

DELL
£18.99
DELL NRX7Y drive bay panel 2.5

DELL NRX7Y drive bay panel 2.5" Bezel panel

DELL
£26.99
DELL KG1CH drive bay panel 8.89 cm (3.5

DELL KG1CH drive bay panel 8.89 cm (3.5") Bezel panel

DELL
£18.99
DELL D981C drive bay panel 8.89 cm (3.5

DELL D981C drive bay panel 8.89 cm (3.5") Bezel panel

DELL
£21.99
ASUS LSI BBU PCIE BRACKET

ASUS LSI BBU PCIE BRACKET

ASUS
£29.99
i-tec Advance USB 3.0 Slim HUB 3 Port + Gigabit Ethernet Adapter

i-tec Advance USB 3.0 Slim HUB 3 Port + Gigabit Ethernet Adapter

i-tec
£18.99
i-tec Metal USB-C HUB 3 Port + Gigabit Ethernet Adapter

i-tec Metal USB-C HUB 3 Port + Gigabit Ethernet Adapter

i-tec
£20.99
i-tec Advance USB-C Slim Passive HUB 3 Port + Gigabit Ethernet Adapter

i-tec Advance USB-C Slim Passive HUB 3 Port + Gigabit Ethernet Adapter

i-tec
£20.99
HPE ML350e Gen8 v2 8 SFF Hot Plug HDD Cage Kit 2.5

HPE ML350e Gen8 v2 8 SFF Hot Plug HDD Cage Kit 2.5" Bezel panel

Hewlett Packard Enterprise
£120.99
HPE 274338-B22 drive bay panel

HPE 274338-B22 drive bay panel

Hewlett Packard Enterprise
£678.99
HPE ProLiant DL560 Gen9 Universal Media Bay Kit Carrier panel

HPE ProLiant DL560 Gen9 Universal Media Bay Kit Carrier panel

Hewlett Packard Enterprise
£174.99
Fujitsu Upgr to Medium 8x SFF Carrier panel

Fujitsu Upgr to Medium 8x SFF Carrier panel

Fujitsu
£458.99