Hitachi GR2000 - Manual (Page 215)

Increment unit GR2000-2S
GR2000-4H,
GR2000-6H
GR2000-10H,
GR2000-20H
BCU-S300S
BCU-H300H
BCU-M300H
BCU-L300H
BCU-S850S
BCU-H850H
BCU-M850H
BCU-L850H
Base 64MB 128M 256MB
Add One MS64 128MB ---
Add One MS128 --- 256MB ---
Add Two MS128s and
Remove Base (64MB)*
256MB ---
* Removed base memory of BCU can be utilized for RP memory increment.
Table 4-9 RP Memory Increment by RP Type
RP Type Resulting Memory Capacity MB
Base Add One MS64 Add One MS1
RP-A1 or equivalent 32 96 Not applicab