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.
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
Cisco UCSC-BBLKD-S2 drive bay panel Grey

Cisco UCSC-BBLKD-S2 drive bay panel Grey

Cisco
£23.99
QNAP TRAY-25-NK-BLK02 drive bay panel 2.5

QNAP TRAY-25-NK-BLK02 drive bay panel 6.35 cm (2.5") Black, Metallic

QNAP
£16.99
QNAP SP-ES-TRAY-WOLOCK drive bay panel Storage drive tray Black

QNAP SP-ES-TRAY-WOLOCK drive bay panel Storage drive tray Black

QNAP
£18.99
QNAP TRAY-35-NK-BLK05 drive bay panel Storage drive tray Black

QNAP TRAY-35-NK-BLK05 drive bay panel Storage drive tray Black

QNAP
£16.99
QNAP SP-ES-TRAY-LOCK drive bay panel Storage drive tray Black

QNAP SP-ES-TRAY-LOCK drive bay panel Storage drive tray Black

QNAP
£18.99
QNAP TRAY-35-NK-BLK04 drive bay panel Storage drive tray Black

QNAP TRAY-35-NK-BLK04 drive bay panel Storage drive tray Black

QNAP
£16.99
QNAP TRAY-35-NK-BLK001 drive bay panel 3.5

QNAP TRAY-35-NK-BLK001 drive bay panel 8.89 cm (3.5") Black

QNAP
£16.99
QNAP TRAY-35-NK-BLK02 drive bay panel 3.5

QNAP TRAY-35-NK-BLK02 drive bay panel 8.89 cm (3.5")

QNAP
£22.99
QNAP TRAY-35-NK-GLD01 drive bay panel Storage drive tray Black, Gold

QNAP TRAY-35-NK-GLD01 drive bay panel Storage drive tray Black, Gold

QNAP
£16.99