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    <p>Here's the code to get the native block size:</p> <pre><code>#include &lt;sys/stat.h&gt; #include &lt;IOKit/IOKitLib.h&gt; #include &lt;IOKit/IOBSD.h&gt; #include &lt;IOKit/storage/IOMedia.h&gt; #include &lt;CoreFoundation/CoreFoundation.h&gt; // look up device number with stat struct stat stats; if (stat(path, &amp;stats) != 0) { return; } // use st_rdev instead of st_dev if // the path is a device (/dev/disk0) int bsd_major = major(stats.st_dev); int bsd_minor = minor(stats.st_dev); CFTypeRef keys[2] = { CFSTR(kIOBSDMajorKey), CFSTR(kIOBSDMinorKey) }; CFTypeRef values[2]; values[0] = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &amp;bsd_major); values[1] = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &amp;bsd_minor); CFDictionaryRef matchingDictionary; matchingDictionary = CFDictionaryCreate(kCFAllocatorDefault, &amp;keys, &amp;values, sizeof(keys) / sizeof(*keys), &amp;kCFTypeDictionaryKeyCallBacks, &amp;kCFTypeDictionaryValueCallBacks); CFRelease(values[0]); CFRelease(values[1]); // IOServiceGetMatchingService uses up one reference to the dictionary io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, matchingDictionary); if (!service) { return; } CFNumberRef blockSizeProperty; blockSizeProperty = (CFNumberRef)IORegistryEntryCreateCFProperty(service, CFSTR(kIOMediaPreferredBlockSizeKey), kCFAllocatorDefault, 0); if (!blockSizeProperty) { return; } int blockSize; CFNumberGetValue(blockSizeProperty, kCFNumberIntType, &amp;blockSize); CFRelease(blockSizeProperty); // blockSize is the native block size of the device </code></pre>
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    1. POfind natural block size of the media being used by file handle
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    1. USGeorg Schölly
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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