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The IBM 3330 Series consists of the IBM 3333 Disk Storage
and Control, the IBM 3330 Disk Storage, and the IBM 3336
Disk Pack. Several combinations within the 3330 Series
provide direct-access storage for the IBM System/360 Model
195 and the IBM System/370 Models 125, 135, 145, 155,
155-11, 158, 165, 165-11, 168, and 195. Figure 1 shows
possible combinations of the 3330 Series using these
systems. Together they form a modular, high performance,
large capacity storage facility for applications such as:
• Airline reservations.
• Inventory and manufacturing control.
• Graphic processing.
• Time-sharing.
• Message switching.
• Systems residence.
• General purpose storage.
• Other applications requiring either direct or sequential
processing.
3333 DISK STORAGE AND CONTROL
The 3333
is
the largest module of the 3330 Series. The con-
trol portion is coupled with .two 3330 drives to create the
basic 3330 Series configuration. Currently two models are
available: Models 1 and 11. Functional characteristics of
the two models are similar except that the Model H provides
twice the data capacity of the Model l. The 3333 Model 11
also has a Write Format Release feature which allows Storage
Control to disconnect after the last format Write record on
a track and to service other drives while the drive "pads"
zeros to the end of the track.
3330 DISK STORAGE
When the 3330 is attached to the 3333 it provides a maximum
of 4 modules and 8 drives. Three models are available:
Models 1, 2, and 11. The Model 1 module has two drives,
whereas the Model 2 module has one. The Model 11 module
has two drives, each of which has twice the data capacity of
either a Model 1 or 2 drive. All drives have:
• 30 millisecond average access time.
• 8.4 millisecond average rotational delay.
• 806,000 bytes-per-second nominal read/write rate.
Page of GA26-1615-3
Revised August 19, 1974
By TNL:
GN26-0310
INTRODUCTION
3336 DISK PACK
The 3336 Model 1 Disk Pack is removable and interchangeable
with the 3330 Series Model 1 or 2 drives only. The 3336
Model 11 Disk Pack is removable and interchangeable with
other 3330 Series Model 11 drives only. These disk packs
provide the following capabilities.
3336
3336
Model 1
Model 11
Cylinders per
404 (plus 7
_ 808 (plus 7
pack
alternates)
alternates)
Tracks per
19
19
cylinder
Tracks per
7 ,809 (including
15.485 (including
pack
133 alternates)
133 alternates)
Track capacity
13,030
13,030
(bytes)
Cylinder
247,570
247,570
capacity (bytes)
Pack capacity
100 million
200 million
(approx bytes)
STRING SWITCH FEATURE
This feature allows a 3333 Disk Storage and Control and its
attached string of 3330 Disk Storage modules to be dynami-
cally switched between two Storage Controls (see Figure 2).
The attachments may be a combination of any of the
following:
(1)
S/370 Model 135 IFA, (2) S/370 Model 145
ISC, (3) S/370 Models 158 and 168 ISC, and/or (4) a 3830
Storage Control Model 2. The 3333 can be dedicated to a
single Storage Control with an Enable/Disable switch.
The String Switch is similar to the Two Channel Switch
feature for the.3830 Storage Control.
32 DRIVE EXPANSION FEATURE
This feature provides for the attachment of up to two
additional 3333s to a Storage Control (see Figure 2). The
storage controls can be a combination of any of the follow-
ing:
(1)
3830 Storage Control Model 2, (2) S/370 Model
145 ISC, and/or (3) S/370 Models 158 and 168 ISC. The
String Switch and 32 Drive Expansion features can bP. used
together, as shown in Figure 2.
Introduction 1
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