代码之家 › 专栏 › 技术社区 › Kornel

如何在Mac OS X中检测SSD?

iokit ssd macos cocoa

Kornel · 技术社区 · 16 年前

是否有可靠、快速、确定的方法(即。不一个基准测试)来检查系统驱动器Mac OS X是否为固态驱动器?

Device Characteristics 属于 IOAHCIBlockStorageDevice 包含此信息。如何以编程方式阅读它?

match = IOBSDNameMatching(kIOMasterPortDefault,0,"disk0s2");
IOServiceGetMatchingServices(kIOMasterPortDefault, match, &iterator);
while(entry = IOIteratorNext(iterator)) {
   do {
     entry = IORegistryEntryGetParentEntry(nextMedia, kIOServicePlane, &entry);
     dict = IORegistryEntryCreateCFProperty(nextMedia, 
            CFSTR(kIOPropertyDeviceCharacteristicsKey), kCFAllocatorDefault, 0);
     [dict objectForKey:CFSTR(kIOPropertyMediumTypeKey)];
   } 
   while(!dict && entry); 
}

编辑: Here's complete source code . 我已经验证了它与Intel SSD和OCZ Vertex一起工作。

3 回复 | 直到 5 年前

Georg Schölly Crazy Developer 12 年前

如果你想得到这样的信息,你最好的猜测是IOKit。

伊奥雷格 命令行工具或 .

#import "TWDevice.h"

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <paths.h>
#include <sys/param.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/IOBSD.h>
#include <IOKit/storage/IOMedia.h>
#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/Kext/KextManager.h>


@implementation TWDevice

@synthesize name, devicePath, size, blockSize, writable, icon;

+ (NSArray *)allDevices {
    // create matching dictionary
    CFMutableDictionaryRef classesToMatch;
    classesToMatch = IOServiceMatching(kIOMediaClass);
    if (classesToMatch == NULL) {
        [NSException raise:@"TWError" format:@"Classes to match could not be created"];
    }

    // get iterator of matching services
    io_iterator_t mediaIterator;
    kern_return_t kernResult;
    kernResult = IOServiceGetMatchingServices(kIOMasterPortDefault,
                                                                      classesToMatch,
                                                                      &mediaIterator);

    if (kernResult != KERN_SUCCESS) {
        [NSException raise:@"TWError" format:@"Matching services did not succed."];
    }

    // iterate over all found medias
    io_object_t nextMedia;
    NSMutableArray *detectedDevices = [NSMutableArray array];
    while (nextMedia = IOIteratorNext(mediaIterator)) {
        NSMutableDictionary *properties;
        kernResult = IORegistryEntryCreateCFProperties(nextMedia,
                                                                                  (CFMutableDictionaryRef *)&properties,
                                                                                  kCFAllocatorDefault, 0);

        if (kernResult != KERN_SUCCESS) {
            [NSException raise:@"TWError" format:@"Getting properties threw error."];
        }

        // is it a whole device or just a partition?
        if ([[properties valueForKey:@"Whole"] boolValue] &&
            ![[properties valueForKey:@"RAID"] boolValue]) {
            TWDevice *device = [[[TWDevice alloc] init] autorelease];

            device.devicePath = [NSString stringWithFormat:@"%sr%@", _PATH_DEV, [properties valueForKey:@"BSD Name"]];
            device.blockSize = [[properties valueForKey:@"Preferred Block Size"] unsignedLongLongValue];
            device.writable = [[properties valueForKey:@"Writable"] boolValue];
            device.size = [[properties valueForKey:@"Size"] unsignedLongLongValue];

            io_name_t name;
            IORegistryEntryGetName(nextMedia, name);
            device.name = [NSString stringWithCString:name encoding:NSASCIIStringEncoding];

            â¦

            [detectedDevices addObject:device];
        }

        // tidy up
        IOObjectRelease(nextMedia);
        CFRelease(properties);
    }
    IOObjectRelease(mediaIterator);

    return detectedDevices;
}

@end

Ana Betts 16 年前

事实上,我认为你应该走基准测试路线,因为它更准确地回答了你的问题——你不需要 真正地

只需从底层/dev/diskX读取一组随机扇区,如果它满足您的要求,您可以将其视为“快速”驱动器

fzwo 6 年前

这似乎只适用于内部驱动器。我找不到使用IOKit查询三星T5外部usb3ssd的方法,也找不到东芝Canvio usbhddd。不过,我确实在MBP中管理了内部驱动器。

Disk utility也不认为三星是SSD,因此我认为除了测量实际性能之外,可能没有其他方法。

Stephan Eggermont 16 年前