The phrase "a preferred format" is correct and usable in written English.
You can use it when discussing a specific format that is favored or recommended for a particular purpose or context.
Example: "Please submit your report in a preferred format to ensure consistency across all submissions."
Alternatives: "an ideal format" or "a favored format".
GP4 Participants' preferences for a preferred format for reporting an AEFI varied across the three professional groups, and covered the current options for paper, phone, fax and electronic reporting.
Is there a preferred format?
First up is a 1964 concert featuring Mr. Thompson's music arranged for octet, a preferred format of his.
Via DEM Explorer, users are able to not only retrieve the original DEM files directly, but also obtain on-demand DEM data for any area of interest in a preferred format and projection.
The user can browse the available datasets, and view them in a preferred format (see Fig. 2).
She or he will no doubt have a preferred format for handling this information, but I would strongly recommend using a well-respected database (best) or spreadsheet (ok) program.
If there is a preferred formatting, do not deviate from this without permission or good reason.
Since the Health Insurance Portability and Accountability Act (HIPAA) of 1996, federal law has guaranteed patients access to their protected health information in a timely manner, in a patient's preferred format, and at a reasonably low processing fee.
The site is also faster, ensuring content can be delivered seamlessly in a client's preferred format.
That studio recently telegraphed plans for a multifront Oscar campaign for its Batman blockbuster "The Dark Knight" by sending awards voters a query about their preferred format for promotional DVDs.
He was a marathon spielmeister, whose preferred format was the twelve-hour lecture, split into three parts over two days, with no text but with plenty of charts and slides.
