The Blob data type was introduced to improve VFP compabilty with MS SQL Server and other RDBMS. Using it makes workarounds described in How to work with Image field type on SQL Server (binary data)? FAQ #7995 unnecessary.

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>Usually I used a Memo field to save image files in a table. Now there is a new data type, Blob, that I can use to save the image file, even with the same code as the memo:
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APPEND MEMO MyBlobField FROM Test.JPG OVERWRITE

>Could somebody explain me what the advantages would be of using a blob field instead of a memo field?