HP Flexible Disk Formatsx Formats

User Manual: HP Flexible Disk Formats

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HP Flexible Disk Formats
Martin Hepperle, June 2016
Nomenclature
 0.5 MB media is typically 250…360 KB formatted (SS/DD)
 1.0 MB media is typically 600…720 KB formatted (DS/DD)
 2.0 MB media is typically 1.20…1.44 MB formatted (HD)
Product
0.5-Mbyte Media 1.0-Mbyte Media 2.0-Mbyte Media
HP 9122D/S
E
D
N
HP 9122C
E/2
D/2
D
HP 9123D
E/2
D
N
HP 9133D/H/L
E
D
N
HP 9153C
E/2
D/2
D
D = Recommended for daily use.
D/2 = Recommended for daily use; data transferred at one-half the normal rate.
E = Recommended for data exchange only.
E/2 = Recommended for data exchange only; data transferred at one-half the normal rate.
N = Never use; product unable to identify 2-Mbyte media.
Table 1: Flexible Disk Media Usage as Recommended by HP.

Format
HP

Bytes/Sector
256

Sectors/Track
30

Tracks/Side
67

Sides
1

Sectors
2010

Capacity
514'560

Table 2: Format Data, HP 9885M, 9885S, 8-inch SS/DD media. For 9800 Series, 21MX and similar machines.
Format
HP
IBM

Bytes/Sector
256
128

Sectors/Track
30
26

Tracks/Side
77
77

Sides
2
1

Sectors
4620
2002

Capacity
1'182'720
256'256

Table 3: Format Data, HP 9895A, 8-inch SS/DD media. For 9800 Series and similar machines.
Format

Bytes/Sector Sectors Tracks/Side

INITIALIZE

256

16

70 (−4 = 66) *

Sides
1

Sectors

Capacity

1120 (1056) 286'720 (270'336)

*

The HP format uses 4 spare tracks so that 66 remain. The values given for Sectors and Capacity are for the
complete disk, values in parentheses subtract these spare tracks and represent the true available capacity.
Table 4: Format Data, HP 85, with 9121S, 9121D, 9133A disk drive, 3½-inch DD media.
Format Bytes/Sector Sectors/Track Tracks/Side Sides
Sectors
Capacity
Typical
0,1
256
16
77 (−2 = 75) *
2
2464 (2400) 630'784 (614'400) 9000/200
2
512
9
77 (−2 = 75) *
2
1386 (1350) 709'632 (691'200)
HP 150
3
1024
5
77 (−2 = 75) *
2
770 (750)
788'480 (768'000)
4**
256
16
70 (−4 = 66) *
1
1120 (1056) 286'720 (270'336)
16
512
9
80
2
1440
737'280
* The HP format uses 2 per side (resp. 4 spare tracks for single sided disks) so that 66 resp. 75 remain. The values
given for Sectors and Capacity are for the complete disk, values in parentheses subtract these spare tracks and
represent the true available capacity.
** Option 4 can be used to format single-sided 0.5-Mbyte media as well as double-sided 1-Mbyte media.
If a 1-Mbyte disk is formatted with Option 4 only one side of the disk will be formatted. Option 4 is also produced
by the INITIALIZE command of the HP-85.
Table 5: Format Data: HP 9122C, 9122D/S, 9123D, 9133D/H/L, 9153A/B/C, 3½-inch DD media,
Format
0,1,4

Bytes/Sector
256

Sectors/Track
32

Tracks/Side
77 (−2 = 75) *

Sides
2

Sectors
4928 (4800)

Capacity
1'261'568 (1'228'800)

2
512
18
77 (−2 = 75) *
2
2000 (2700) 1'419'264 (1'382'400)
3
1024
10
77 (−2 = 75) *
2
1540 (1500) 1'576'960 (1'536'000)
16
512
18
80
2
2880
1'474'560
* HP format uses 2 spare tracks per side resp. 4 for single sided disks. The values given for Sectors and Capacity are
for the complete disk, values in parentheses subtract these spare tracks and represent the true available capacity.
Table 6: Format Data, HP 9122C and 9153C, 3½-inch 2 MB (HD) media.
Format

Bytes/Sector Sectors/Track Tracks/Side Sides
Sectors
Capacity
256
16
35 (–2 = 33) *
2
1120 (1056) 286'720 (270'336)
* HP format uses 2 spare tracks per side so that 33 remain. The values given for Sectors and Capacity are for the
complete disk, values in parentheses subtract these spare tracks and represent the true available capacity.
Sector IDs are from 0 to 15.
Table 7: Format Data, HP 82901M, 82902M, 9130A, and 9135A, 5¼-inch DD media
Format Bytes/Sector Sectors/Track
Tracks/Side
Sides
Sectors
Capacity
1*
256
16
35 (–2 = 33) ***
2
1120 (1056) 286720 (270'336)
2*,**
512
9
40
2
720
368’640
3*
1024
5
37
2
370
378’880
4*,**
512
8
40
1
320
163’840
5*,**
512
9
40
1
360
184’320
6*,**
512
8
40
2
640
327’680
* Formatting 5¼ inch media only.
** IBM compatible format.
*** HP format uses 2 spare tracks per side so that 33 remain. The values given for Sectors and Capacity are for the
complete disk, values in parentheses subtract these spare tracks and represent the true available capacity.
Table 8: Format Data, HP 9125S and 9127A, 5¼-inch DD media
Format Bytes/Sector Sectors/Track
1*,**
256
16
2*,**
512
9
3*,**
1024
4*,**
256
16
5*,**
512
9
6*,**
1024
* Formatting 3½ inch media only.
** IBM compatible format.

Tracks/Side
80
80
80
80
80
80

Sides
1
1
1
2
2
2

Sectors
1280
720

Capacity
327’680
368’640

2560
1440

655’360
737’280

Media Byte

F9

Table 9: Format Data, HP 9144, HP-150, MS-DOS, IBM-PC compatibility, 3½-inch DD media.
Format
Bytes/Sector Sectors/Track Tracks/Side Sides Sectors Capacity Available
FORMAT /W
256
16
77
1
1232
315’392 264’192
FORMAT /X
256
16
77
2
2464
630’784 618’496
FORMAT /Y*
512
9
80
2
1440
737’280 700’416
FORMAT /Z
1024
5
77
2
770
788’480 780’288
* This format can be read by “modern” (2015) HD floppy drives (normally used with 1.44 MB disks) and is
therefore suitable for data exchange. Works e.g., with external USB floppy drives. Of course, the disk must be
DS/DD, 720 KB, not HD 1.44 MB. It is recommended to format such DS/DD disks on low capacity 720 KB drives
(not on HD drives).
Table 10: Format Data, HP 110 with 9114B disk drive, 3½-inch DD media.

Notes:





Number of Sectors / Disk = Sectors/Track * Tracks/Surface * Surfaces/Disk
Capacity denotes nominal, unformatted disk capacity in Bytes.
Depending on the file system, volume and directory entries or file allocation tables reduce the capacity
available for actual data.
Tracks/Side is also called Cylinders

HP Model

Drive Manufacturer

9121D, S

SONY

9122D, S

SONY

9122C
9133A, B
9133V, XV

SONY(?)
SONY
SONY

9133D, H, L

SONY

9114A, B

SONY

9153A

SONY

9153A
82901M/S
82902M/S
9885M/S
9895A
13272
64110A
64100B
9130A/K
9135A
9126
9836

SONY
Tandon
Tandon

TM-100-2A
TM-100-2A

Tandon
Tandon
Tandon
Tandon
Tandon
Tandon
Tandon

TM-100-2A(?)
TM-100-2A(?)
TM-100-2A(?)
TM-100-2A
TM-100-2A
TM-100-2A(?)
TM-100-2A (?)

Table 11: Floppy Disk Drive Hardware.

Drive Model
OA-D30V-1
OA-D31V-1
OA-D31V-14
OA-D32W-10
OA-D32W-11
OA-D31V-??
OA-D31V-??
OA-D32W-10
OA-D32W-11
OA-D32W-10
OA-D32W-11
OA-D32W-10
OA-D32W-11

Heads RPM Mode Tracks/Surface Command Set
1

600

MFM

70

AMIGO

2

600

MFM

80

SS/80

2
1
1

300
600
600

MFM
MFM
MFM

80
70
70

SS/80
SS/80
AMIGO

2

600

MFM

80

SS/80

2

600

MFM

80

SS/80

2

600

MFM

80

SS/80

2
2
2
1
2
1
1
1
2
2
1
1

300
300
300
360
360
300
300
300
300
300
300
300

MFM
MFM
MFM
MFM
MFM
MFM
MFM
MFM
MFM
MFM
MFM
MFM

80
35
35
67
77
35
35
35
35
35
35
35

SS/80
AMIGO
AMIGO
SS/80
AMIGO
SS/80
SS/80
SS/80
SS/80
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