The contents of each record in cylinder 0 track 0 are as follows: RO Nothing. R1 IPL record -- Puts the system into wait state if storage volume is
loaded before CP nucleus is built.
R2 Checkpoint record
for a warm start. Used by CP to save and retrieve inforaation
R3 Voluae label -- Same as OS VOL1 label. On CP systea residence volume, area in data record marks the beginning of the system directory. A label is automatically written when cylinder 0 is formatted. The owner field of the label record contains "VB/310" if there is allocation data present in R4.
R4 Allocation Byte Map Bach byte identifies a cylinder and
specifies its usage (paging, spooling I directory, and so on). This aap is filled in by the ALLOCATB function of the D!KF!T service
program.
RS Foraat 4 as DSCB type label --For compatibility with os. Also,
the IBCDASDI prograa uses this label to keep a record of how aany alternate tracks remain available for assignment on this disk. The
Format/Allocate program will preserve this information by first
reading it fro. any existing Foraat 4 label, and then writing it
back in the new label.
R6 Format S OS DSCB type label For coapatibility with as. Label
indicates to os that no space is available cn this voluae.
FR Is one or more filler records.
Format/Allocate program control statements may be supplied in card form via a card reader, or may be entered at the system console. All error messages regarding improper specification of control statements
are displayed at the console. FORHAT/ALLOCATB PROGRAH CIRD INPUT Punch control statements for card input
field is separated from the adjacent field
row cause the insertion of a default value.
the insertion of two default 114 VM/310 OFerator's Guide
start in coluan 1, and each by a comma. Two co •• as in a
Three commas in a row cause

!gte: The only default values permitted are
starting and ending cylinders. The defaults
cylinders of the volume, respectively.
those that define the
are the first and last
Comments must be preceded by at least three blanks.
The control card entries for the Format/Allocate program must be in
the following order: • Format function:
FORMAT,devadr,devtype,volser,startcyladr,endcyladr • Allocate function:
ALLOCATE,devadr,devtype,volser
TEMP,startcyladr,endcyladr
PERM,startcyladr,endcyladr
TDSK,startcyladr,endcyladr
DRCT,startcyladr,endcyladr
END • Label functions: ,FORMAT, devadr,devtype, vOlser,LABEL FORBAT, ALLOCATE, and LABEL are Format/Allocate program control words
and may be abbreviated to one letter.
The format of the FORMAT control statement is:
FORBAT,devadr,devtype,volser,startcyladr,endcyladr
devadr is a three-digit hexadecimal number that identifies the
address of the device that the Format/Allocate program is
to act upon. Valid device addresses under CBS are X'OOl' to X'5FF' for ECMODE OFF and X'OOl' to X'FFF' for HCftODE ON. devtype is a four-to-seven character field that defines an approved
device for the Format/Allocate program. Approved device
types are 2314, 2319, 3330, 3330-11, 3340-35, 3340-70, 3350, 2305-1, and 2305-2., Specify .3333 as 3330, and 3340-70F or 3344 as 3340-70. Specify a 3350 device in
3330-1 compatibility mode as a 3330, and a 3350 in 3330-11 compatibility mode as a 3330-11.
volser is a one-to-six character field that represents the volume serial number of the volume you are formatting. startcyladr is the starting cylinder address on the DISD on which the format function is to be performed. The start cylinder
address is entered as decimal digits.
endcyladr is the last cylinder address on the DASD for.at function is to be The
address is entered as decimal digits.
on which the
end cylinder
Section 4. Vft/310 Service Programs 175