The prison was split into many divisions, named using letters of the alphabet.

A – Short and long-term prisoners of good behaviour but during the late 1980s till its closure it became a scene of many monthly bashings, stabbings and bludgeonings.

B – Long-term prisoners with behaviour problems
C – Vagabonds and short term prisoners, where Ned Kelly was imprisoned (Demolished early 1970s)
D – Remand prisoners
E – The hospital, later turned into a dormitory division housing short term prisoners
F – Remand and short-term
G – Psychiatric problems
H – High security, discipline and protection
J – Young Offenders Group- Later for long-term with record of good behaviour
Jika Jika – maximum security risk and for protection, later renamed K Division
The prison was split into many divisions, named using letters of the alphabet.
A – Short and long-term prisoners of good behaviour but during the late 1980s till its closure it became a scene of many monthly bashings, stabbings and bludgeonings.
B – Long-term prisoners with behaviour problems
C – Vagabonds and short term prisoners, where Ned Kelly was imprisoned (Demolished early 1970s)
D – Remand prisoners
E – The hospital, later turned into a dormitory division housing short term prisoners
F – Remand and short-term
G – Psychiatric problems
H – High security, discipline and protection
J – Young Offenders Group- Later for long-term with record of good behaviour
Jika Jika – maximum security risk and for protection, later renamed K Division
HM Prison Pentridge