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IBM Type 1 - Just Solve the File Format Problem

IBM Type 1

From Just Solve the File Format Problem
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(Created page with "{{FormatInfo |formattype=physical |subcat=Floppy disk }} '''IBM Type 1''' (33FD) is a type of 8" floppy disk used by IBM. It uses FM encoding at a track density of 48 trac...")
 
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|formattype=physical
 
|formattype=physical
 
|subcat=Floppy disk
 
|subcat=Floppy disk
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|released=1973
 
}}
 
}}
'''IBM Type 1''' (33FD) is a type of 8" floppy disk used by IBM. It uses [[FM encoding]] at a track density of 48 tracks per inch and a bit density of 3,268 bits per inch, on single-sided single-density media. There are three subtypes, with different sector layouts and slightly different total storage capacity.
+
'''IBM Type 1''' is a type of 8" floppy disk used by IBM for the 33FD drive used in the 1970s and 1980s on some mainframes and minicomputers such as the 370 and System/34. It uses [[FM encoding]] at a track density of 48 tracks per inch and a bit density of 3,268 bits per inch, on single-sided single-density media. There are three subtypes, with different sector layouts and slightly different total storage capacity.
  
 
== 242 KB ==
 
== 242 KB ==
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This format has an index cylinder of 26 128 byte sectors, and 74 regular data cylinders of 8 sectors of 512 bytes each, totalling 592 data sectors with a capacity of 303,104 bytes.
 
This format has an index cylinder of 26 128 byte sectors, and 74 regular data cylinders of 8 sectors of 512 bytes each, totalling 592 data sectors with a capacity of 303,104 bytes.
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 +
== Links ==
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* [https://www.computerhistory.org/collections/catalog/102673001 Computer History Museum: 33FD drive]
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* [http://www.bitsavers.org/pdf/ibm/system34/fe/SY31-0457-5_System_34_5340_System_Unit_Maintenance_Manual_Jan81.pdf IBM System/34 5340 System Unit Maintenance Manual]
 +
* [https://books.google.com/books?id=MFGj_PT_clIC&pg=PA515&lpg=PA515&dq=ibm+33fd&source=bl&ots=ZIjmZ7s7bI&sig=ACfU3U3G3B8qsnQ05KbcUiKH7Lw1VVqc3A&hl=en&sa=X&ved=2ahUKEwj60_vVm7LkAhUCrlkKHZDwB-EQ6AEwFHoECAkQAQ#v=onepage&q=ibm%2033fd&f=false Some references to the drive in a book on IBM 360 and 370 systems
  
 
[[Category:IBM]]
 
[[Category:IBM]]

Revision as of 14:41, 2 September 2019

File Format
Name IBM Type 1
Ontology
Released 1973

IBM Type 1 is a type of 8" floppy disk used by IBM for the 33FD drive used in the 1970s and 1980s on some mainframes and minicomputers such as the 370 and System/34. It uses FM encoding at a track density of 48 tracks per inch and a bit density of 3,268 bits per inch, on single-sided single-density media. There are three subtypes, with different sector layouts and slightly different total storage capacity.

Contents

242 KB

This format has 73 tracks (cylinders) with 26 sectors storing 128 bytes each, for a total of 1,898 sectors holding 242,944 bytes.

284 KB

This format has an index cylinder of 26 128 byte sectors, and 74 regular data cylinders of 15 sectors of 256 bytes each, totalling 1,110 data sectors with a capacity of 284,160 bytes.

303 KB

This format has an index cylinder of 26 128 byte sectors, and 74 regular data cylinders of 8 sectors of 512 bytes each, totalling 592 data sectors with a capacity of 303,104 bytes.

Links

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox

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