diff --git a/source/de/anomic/kelondro/io/records/Records.java b/source/de/anomic/kelondro/io/records/Records.java
index 21cc72deb..b5b4a4431 100644
--- a/source/de/anomic/kelondro/io/records/Records.java
+++ b/source/de/anomic/kelondro/io/records/Records.java
@@ -34,8 +34,9 @@ import de.anomic.kelondro.util.FileUtils;
 import de.anomic.kelondro.util.MemoryControl;
 
 /**
- * The EcoFS is a flat file with records of fixed length. The file does not contain
- * any meta information and the first record starts right at file position 0
+ * The Records data structure is a flat file with records of fixed length.
+ * The file does not contain any meta information and the first record starts
+ * right at file position 0.
  * The access rules are in such a way that a minimum of IO operations are necessary
  * Two caches provide a mirror to content in the file: a read cache and a write buffer
  * The read cache contains a number of entries from the file; a mirror that moves
@@ -126,10 +127,10 @@ public class Records {
      * @param recordsize
      * @return number of records in table
      */
-    public static long tableSize(final File tablefile, final long recordsize) {
+    public static long tableSize(final File tablefile, final long recordsize) throws IOException {
         if (!tablefile.exists()) return 0;
         final long size = tablefile.length();
-        assert size % recordsize == 0;
+        if (size % recordsize != 0) throw new IOException("wrong file size: file = " + tablefile + ", size = " + size + ", recordsize = " + recordsize);
         return size / recordsize;
     }
     
diff --git a/source/de/anomic/kelondro/table/SplitTable.java b/source/de/anomic/kelondro/table/SplitTable.java
index c2abc477c..8a77edcbc 100644
--- a/source/de/anomic/kelondro/table/SplitTable.java
+++ b/source/de/anomic/kelondro/table/SplitTable.java
@@ -162,10 +162,14 @@ public class SplitTable implements ObjectIndex {
                     maxtime = time;
                 }
                 
-                ram = Table.staticRAMIndexNeed(f, rowdef);
-                if (ram > 0) {
-                    t.put(tablefile[i], Long.valueOf(ram));
-                    sum += ram;
+                try {
+                    ram = Table.staticRAMIndexNeed(f, rowdef);
+                    if (ram > 0) {
+                        t.put(tablefile[i], Long.valueOf(ram));
+                        sum += ram;
+                    }
+                } catch (IOException e) {
+                    Log.logWarning("SplitTable", "file " + f.toString() + " appears to be corrupted: " + e.getMessage());
                 }
             }
         }
diff --git a/source/de/anomic/kelondro/table/Table.java b/source/de/anomic/kelondro/table/Table.java
index d9e04d78a..c1c7649d7 100644
--- a/source/de/anomic/kelondro/table/Table.java
+++ b/source/de/anomic/kelondro/table/Table.java
@@ -243,7 +243,7 @@ public class Table implements ObjectIndex {
         return MemoryControl.available() < minmemremaining;
     }
     
-    public static long tableSize(final File tablefile, final int recordsize) {
+    public static long tableSize(final File tablefile, final int recordsize) throws IOException {
         // returns number of records in table
         return Records.tableSize(tablefile, recordsize);
     }
@@ -277,7 +277,7 @@ public class Table implements ObjectIndex {
         return this.table != null;
     }
     
-    public static int staticRAMIndexNeed(final File f, final Row rowdef) {
+    public static int staticRAMIndexNeed(final File f, final Row rowdef) throws IOException {
         return (int) (((long)(rowdef.primaryKeyLength + 4)) * tableSize(f, rowdef.objectsize) * RowCollection.growfactor100 / 100L);
     }