diff -up anaconda-11.4.0.83/isys/isys.c.BAD anaconda-11.4.0.83/isys/isys.c
--- anaconda-11.4.0.83/isys/isys.c.BAD	2008-12-16 13:38:53.000000000 -0500
+++ anaconda-11.4.0.83/isys/isys.c	2008-12-16 13:41:34.000000000 -0500
@@ -679,7 +679,7 @@ static PyObject * doWipeRaidSuperblock(P
     /* put the size in 1k blocks */
     size >>= 1;
 
-    if (lseek64(fd, ((off64_t) 1024) * (off64_t) MD_NEW_SIZE_BLOCKS(size), SEEK_SET) < 0) {
+    if (lseek64(fd, ((off64_t) 512) * (off64_t) MD_NEW_SIZE_SECTORS(size), SEEK_SET) < 0) {
 	PyErr_SetFromErrno(PyExc_SystemError);
 	return NULL;
     } 
@@ -711,7 +711,7 @@ static PyObject * doGetRaidSuperblock(Py
     /* put the size in 1k blocks */
     size >>= 1;
 
-    if (lseek64(fd, ((off64_t) 1024) * (off64_t) MD_NEW_SIZE_BLOCKS(size), SEEK_SET) < 0) {
+    if (lseek64(fd, ((off64_t) 512) * (off64_t) MD_NEW_SIZE_SECTORS(size), SEEK_SET) < 0) {
 	PyErr_SetFromErrno(PyExc_SystemError);
 	return NULL;
     } 
@@ -749,7 +749,7 @@ static PyObject * doGetRaidChunkSize(PyO
     /* put the size in 1k blocks */
     size >>= 1;
 
-    if (lseek64(fd, ((off64_t) 1024) * (off64_t) MD_NEW_SIZE_BLOCKS(size), SEEK_SET) < 0) {
+    if (lseek64(fd, ((off64_t) 512) * (off64_t) MD_NEW_SIZE_SECTORS(size), SEEK_SET) < 0) {
 	PyErr_SetFromErrno(PyExc_SystemError);
 	return NULL;
     }