I haven't made any changes that could account for this. Last night everything worked; this morning comments have disappeared and been replaced with an error message:
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WordPress database error: [Can't open file: 'wp_comments.MYI' (errno: 144)]
SELECT * FROM wp_comments WHERE comment_post_ID = '414' AND comment_approved = '1' ORDER BY comment_date
Also, each page within WP admin begins with
WordPress database error: [Can't open file: 'wp_comments.MYI' (errno: 144)]
SELECT COUNT(*) FROM wp_comments WHERE comment_approved = '0'
When I looked in phpMyAdmin, I found that collation for wp_comments is listed as being "in use". For wp_comments, unlike all other tables, "records" and "size" are blank.
I disabled all my plugins. The problem remains.
I'm running WP2.0.2. The host is Dreamhost.
Any fixes or suggestions would be greatly appreciated. Many thanks.