Draft:Seagate ST-251

Draft article not currently submitted for review.

This is a draft Articles for creation (AfC) submission. It is not currently pending review. While there are no deadlines, abandoned drafts may be deleted after six months. To edit the draft click on the "Edit" tab at the top of the window.

To be accepted, a draft should:

Show the subject qualifies for a Wikipedia article by using multiple sources that meet four criteria. The sources should be (1) reliable (2) secondary (3) independent of the subject (4) talk about the subject in some depth. For some topics, there are alternative criteria.
Be written from a neutral point of view
Respect copyright and do not plagiarize. Do not copy-paste.

It is strongly discouraged to write about yourself, your business or employer. If you do so, you must declare it.

Where to get help

If you need help editing or submitting your draft, please ask us a question at the AfC Help Desk or get live help from experienced editors. These venues are only for help with editing and the submission process, not to get reviews.
If you need feedback on your draft, or if the review is taking a lot of time, you can try asking for help on the talk page of a relevant WikiProject. Some WikiProjects are more active than others so a speedy reply is not guaranteed.

How to improve a draft

Wikipedia:Contributing to Wikipedia – a basic overview on how to edit Wikipedia.
Help:Wikitext – how to use the markup
Help:Referencing for beginners – how to include references
Wikipedia:Article development – how to develop your article
Wikipedia:Writing better articles – how to improve your article
Wikipedia:Verifiability – make sure your article includes reliable third-party sources

You can also browse Wikipedia:Featured articles and Wikipedia:Good articles to find examples of Wikipedia's best writing on topics similar to your proposed article.

Improving your odds of a speedy review

To improve your odds of a faster review, tag your draft with relevant WikiProject tags using the button below. This will let reviewers know a new draft has been submitted in their area of interest. For instance, if you wrote about a female astronomer, you would want to add the Biography, Astronomy, and Women scientists tags.

Add tags to your draft

Editor resources

Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL
Easy tools: Citation bot (help) | Advanced: Fix bare URLs

Last edited by Citation bot (talk | contribs) 3 seconds ago. (Update)

Submit the draft for review!

The ST-255/ST-251 is a family of MFM harddisks, manufactured by Seagate Technology. It has a ST506/ST412 interface.

The ST-238/ST-277 used RLL modulation, increasing the amount of sectors per track, from 17 to 26. Therefore increasing the capacity with the same hardware ^[1].

It was possible to use a good ST-225 with an RLL interface board, and increase the capacity without the higher cost of the company certified RLL models ^[2].

It was a very popular harddisk model, mostly used in the era of the IBM XT clones.

The sound it makes while seeking, is used in many movies.

Variants

ST-225 MFM 20MB capacity.
ST-251 MFM 42MB capacity.
ST-251R RLL 43MB capacity.
ST-238R RLL 33MB capacity.
ST-277R RLL 66MB capacity.

The similarity in storage between ST-251 and ST-251R, while expecting it to increase because of RLL use, is caused by the reduction in the number of head from 6 to 4.

Notes

Seagate at a later date published one datasheet for ST251, ST251R and ST277R, demonstrating the family lineage.

References

^ "ST251_ST251R_ST277R_Product_Manual" (PDF). bitsavers.org.
^ "Seagate_ST-251, Notes". Lo-tech Wiki.

[1] "ST251_ST251R_ST277R_Product_Manual" (PDF). bitsavers.org.

[2] "Seagate_ST-251, Notes". Lo-tech Wiki.

[1]

[2]