diff -r 43365a9b78a3 -r d8d70de2bd36 userlibandfileserver/fileserver/sfat32/sl_mnt.cpp
--- a/userlibandfileserver/fileserver/sfat32/sl_mnt.cpp	Tue Jul 06 15:50:07 2010 +0300
+++ b/userlibandfileserver/fileserver/sfat32/sl_mnt.cpp	Wed Aug 18 11:08:29 2010 +0300
@@ -551,10 +551,8 @@
         return;
         }
 
-    if(LockStatus() != 0)
-        {//-- can't finalise the volume if it has opened objects and not in the consistent state.
-         //-- Theoretically, we can finalise the mount if we have files opened only for read, but at present,
-         //-- it's impossible to detect such situation.
+    if(Locked())
+        {//-- can't finalise the volume if it has opened disk access objects, like Format or RawAccess
         User::Leave(KErrInUse);
         }
 
@@ -613,10 +611,23 @@
 */
 TBool CFatMountCB::VolCleanFlagSupported() const
     {
-        const TFatType fatType=FatType();
-
-        ASSERT(fatType == EFat12 || fatType == EFat16 || fatType == EFat32);
-        return (fatType != EFat12);
+    const TFatType fatType=FatType();
+
+    ASSERT(fatType == EFat12 || fatType == EFat16 || fatType == EFat32);
+    return (fatType != EFat12);
+    }
+
+
+//-----------------------------------------------------------------------------------------
+/**
+    @return Volume size in bytes according to the number of usable clusters.
+    This approach is not applicable to RAM drive, because its size isn't fixed and can be adjusted by the system.
+*/
+TUint64 CFatMountCB::VolumeSizeInBytes() const
+    {
+    ASSERT(ConsistentState());
+    ASSERT(!iRamDrive);
+    return ((TUint64)UsableClusters()) << ClusterSizeLog2();
     }
 
 //-----------------------------------------------------------------------------------------
@@ -681,16 +692,21 @@
 
 
     const TUint32 freeClusters = FAT().NumberOfFreeClusters(bSyncOp);
-
+    aVolume.iFree = (TInt64)freeClusters << ClusterSizeLog2();
     __PRINT1(_L("CFatMountCB::VolumeL() free clusters:%d"), freeClusters);
 
-    aVolume.iFree = (TInt64)freeClusters << ClusterSizeLog2();
-
-    if (drvInfo.iType==EMediaRam)
+
+    if(drvInfo.iType==EMediaRam)
+        {//-- a special case. RAM drive size is variable and adjustable. It should be calculated from aVolume.iFree and CMountCB::iFree
+        ASSERT(iRamDrive);
         aVolume.iSize=aVolume.iFree+iSize;
-
-    aVolume.iSize-=ClusterBasePosition(); // Allow for bytes used by FAT etc
-    aVolume.iSize=(aVolume.iSize >> ClusterSizeLog2()) << ClusterSizeLog2();  //-- round down to cluster size
+        aVolume.iSize-=ClusterBasePosition(); // Allow for bytes used by FAT etc
+        aVolume.iSize=(aVolume.iSize >> ClusterSizeLog2()) << ClusterSizeLog2();  //-- round down to cluster size
+        }
+    else
+        {//-- normal case; the volume size is determined by amount of usable clusters
+        aVolume.iSize = VolumeSizeInBytes();
+        }
 
     }
 
@@ -4277,7 +4293,7 @@
     TInt nRes;
 
     if(LockStatus()!=0)
-        {
+        {//-- can't run if the volume has opened objects, like files, directories, formats etc.
 		__PRINT(_L("CFatMountCB::ScanDrive() locked!\n"));
         return KErrInUse;
         }