Hello Ozodjon,

005-052-129 is compatible with a 25 slot DAE for your Unity 350F. 005-052-129 will not work in a 80 slot DAE.

DC NEBS is the unity drive model, as stated in the following.

Unity drive models use the following prefixes

• D3 = AC storage

• D3FC = AC FAST cache

• D3AF = AC storage when used in All-Flash-Array (AFA)

• D3N = DC NEBS storage

• D3NFC = DC NEBS FAST Cache