crwdns2936637:0crwdne2936637:0 crwdns2853008:0crwdne2853008:0 crwdns2861143:0crwdne2861143:0

Announced on October 16, 2014, identifiable by the model number A1347 and EMC 2840.

crwdns2934591:0197crwdne2934591:0 crwdns2934593:0crwdne2934593:0

crwdns2933897:0crwdne2933897:0

usb 2 external ssd slow to boot

hello I have a samsung T7 ssd connected to my Mac via usb 3, it seems very slow and the system takes a long Time to boot up, and open applications, I have run black magic disk speed test and get these results 37.1MB/s write and 34.7mb/s read, I have also tried connecting the drive with the usb-c cable using a usb-C to usb A adaptor which I get speeds of 400mb/s read and 380mb/s write but I have found this connection frustrating because I Have the machine set to shut down on a Friday and boot on a Monday ,and when the drive is connected via the usb-c to usb-a adaptor and tries to to boot on Monday on the screen I get a file with a flashing question mark and I have to restart with the power button and it boots and runs until the Friday shut down , any ideas why the drive would be running slow or not able to be found when set to boot up on a certain day.

thanks in advance

Leigh

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0

crwdns2933313:01crwdne2933313:0

crwdns2934221:0crwdne2934221:0
crwdns2931211:0crwdne2931211:0 crwdns2931215:0crwdne2931215:0 crwdns2934225:0crwdne2934225:0
crwdns2934057:0crwdne2934057:0

crwdns2933897:0crwdne2933897:0

The flashing ? Is because the systems firmware is not finding what it thinks is the boot drive. Basically you’ve got it set for a different drive that what you want, go into the Startup preference setting and with the drive connected alter it to use that drive.

crwdns2934105:0crwdne2934105:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 1

crwdns2944067:05crwdne2944067:0:

I have tried what you said, when I go to system preferences and select startup disk there is only one drive there and that is my ssd boot drive , when I try and schedule a restart the system just boots to the flashing question mark and I have to press the power button to get it to boot normally this could happen up to three times before the system boots, could the problem be the Usb-c to usb converter that I am using with the usb-c cable

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

@lethal99887 - Sorry it’s likely a timing issue between the interface conversions. What happens when you use a USB-A thumb drive or Thunderbolt connected bootable drive?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

when I boot with the same drive using a usb-A cable it's boots fine, I have just swapped the usb-c cable and so far there doesn't seem to be an issue

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

@lethal99887 - I think that nails it. I have a bunch of the T5 drives but I used them for data only. I don’t think Samsung expected people to use the drives as boot drives.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

thank you for your help

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0

crwdns2934229:0crwdne2934229:0

Lethal crwdns2934231:0crwdne2934231:0
crwdns2936625:0crwdne2936625:0:

crwdns2936751:024crwdne2936751:0 0

crwdns2936753:07crwdne2936753:0 2

crwdns2936753:030crwdne2936753:0 5

crwdns2942667:0crwdne2942667:0 35