CREATE TABLE table_34504 ("Volume" TEXT, "Discs" FLOAT, "Episodes" FLOAT, "Region 1 release" TEXT, "Region 2 release" TEXT, "Region 4 release" TEXT)

What discs has a region 1 release date of January 22, 2008?
SELECT "Discs" FROM table_34504 WHERE "Region 1 release" = 'january 22, 2008'
SELECT "Discs" FROM "table_34504" WHERE "Region 1 release" = 'january 22, 2008'