diff --git a/sdcard/sdcard.c b/sdcard/sdcard.c
index dba5a4e..a95513c 100644
--- a/sdcard/sdcard.c
+++ b/sdcard/sdcard.c
@@ -912,7 +912,7 @@
         out.major = FUSE_KERNEL_VERSION;
         out.minor = FUSE_KERNEL_MINOR_VERSION;
         out.max_readahead = req->max_readahead;
-        out.flags = FUSE_ATOMIC_O_TRUNC;
+        out.flags = FUSE_ATOMIC_O_TRUNC | FUSE_BIG_WRITES;
         out.max_background = 32;
         out.congestion_threshold = 32;
         out.max_write = 256 * 1024;
@@ -941,7 +941,7 @@
     int len;
     
     for (;;) {
-        len = read(fuse->fd, req, 8192);
+        len = read(fuse->fd, req, sizeof(req));
         if (len < 0) {
             if (errno == EINTR)
                 continue;