为什么下载的视频文件不能到SD卡上去呢?

页面:/news/view-3129454/ | 耗时:1.0017 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=3129454 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3129454 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3129454 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1103141,1055217,1115685,1104461,1117421,1114434,1096877,1112196,1052747,1103066,1113495,1099613,1080110,1114778,1108718,1094659,988667,1131813,1057102,1114500,1087573,1112318,1047257,1128825,1065669,1107827,1115475,1061728,1063935,1099871) ORDER BY field (ArticleID,1103141,1055217,1115685,1104461,1117421,1114434,1096877,1112196,1052747,1103066,1113495,1099613,1080110,1114778,1108718,1094659,988667,1131813,1057102,1114500,1087573,1112318,1047257,1128825,1065669,1107827,1115475,1061728,1063935,1099871)