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Most USB flash drives weigh less than 30 g (1 oz).[35] While some manufacturers are competing for the smallest size,[36] with the biggest memory, offering drives only a few millimeters larger than the USB plug itself,[37] some manufacturers differentiate their products by using elaborate housings, which are often bulky and make the drive difficult to connect to the USB port. Because the USB port connectors on a computer housing are often closely spaced, plugging a flash drive into a USB port may block an adjacent port. Such devices may carry the USB logo only if sold with a separate extension cable. Such cables are USB-compatible but do not conform to the USB standard.[38][39]
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Original flash memory designs had very limited estimated lifetimes. The failure mechanism for flash memory cells is analogous to a metal fatigue mode; the device fails by refusing to write new data to specific cells that have been subject to many read-write cycles over the device's lifetime. Premature failure of a "live USB" could be circumvented by using a flash drive with a write-lock switch as a WORM device, identical to a live CD. Originally, this potential failure mode limited the use of "live USB" system to special-purpose applications or temporary tasks, such as:
Digital audio files can be transported from one computer to another like any other file, and played on a compatible media player (with caveats for DRM-locked files). In addition, many home Hi-Fi and car stereo head units are now equipped with a USB port. This allows a USB flash drive containing media files in a variety of formats to be played directly on devices which support the format. Some LCD monitors for consumer HDTV viewing have a dedicated USB port through which music and video files can also be played without use of a personal computer.
In the arcade games Pump it Up NX2 and Pump it Up NXA, a specially produced flash drive is used as a "save file" for unlocked songs, as well as for progressing in the WorldMax and Brain Shower sections of the game.[citation needed]
Flash drives implement the USB mass storage device class so that most modern operating systems can read and write to them without installing device drivers. The flash drives present a simple block-structured logical unit to the host operating system, hiding the individual complex implementation details of the various underlying flash memory devices. The operating system can use any file system or block addressing scheme. Some computers can boot up from flash drives.
Some manufacturers deploy physical authentication tokens in the form of a flash drive. These are used to control access to a sensitive system by containing encryption keys or, more commonly, communicating with security software on the target machine. The system is designed so the target machine will not operate except when the flash drive device is plugged into it. Some of these "PC lock" devices also function as normal flash drives when plugged into other machines.
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The P2MCache lock is a spin lock compromising the fairness across execution threads that wait for the P2MCache. As a result, the ESXi host might fail with purple diagnostic screen and the following error: 2017-09-15T06:50:17.777Z cpu11:153493)@BlueScreen: Spin count exceeded - possible deadlock with PCPU 19 2017-09-15T06:50:17.777Z cpu11:153493)Code start: 0x418034400000 VMK uptime: 8:21:18:05.527 2017-09-15T06:50:17.778Z cpu11:153493)Saved backtrace from: pcpu 19 SpinLock spin out NMI 2017-09-15T06:50:17.778Z cpu11:153493)0x439127a1bb60:[0x4180345911bf]VmMemPin_ReleasePhysMemRange@vmkernel#nover+0x1f stack: 0x0 2017-09-15T06:50:17.778Z cpu11:153493)0x439127a1bbb0:[0x41803455d706]P2MCache_Release@vmkernel#nover+0xa6 stack: 0x4393bb7a7000 2017-09-15T06:50:17.779Z cpu11:153493)0x439127a1bbf0:[0x4180345658a2]PhysMem_ReleaseSGE@vmkernel#nover+0x16 stack: 0x0
When you use devices with a physical block size other than 512 or 4096 bytes, in the /var/log/vmkernel.log file of the ESXi host you might see multiple warning messages similar to: ScsiPath: 4395: The Physical block size "8192" reported by the path vmhba3:C0:T1:L0 is not supported.
Inefficient block allocation mechanisms might lead to multiple iterations of metadata reads. This causes a long quiescing time while creating and extending thick provisioned lazy zeroed VMDK files on a VMFS6 datastore.
This issue is specific to vSphere Virtual Volumes datastores when a VMDK file is assigned to different SCSI targets across snapshots. The lock file of the VMDK is reassigned across different snapshots and might be incorrectly deleted when you revert the virtual machine to a snapshot. Due to the missing lock file, the disk does not open, and the virtual machine fails to power on.
If you have a virtual machine on a SeSparse snapshot and you query the physical layout of the VMDK from the Guest Operating System or a third-party application, a physical CPU lockup might be triggered if the VMDK file size is not a multiple of 4K. As a result, the ESXi host fails with a purple screen.
If you migrate a virtual machine with a NetX filter across clusters by using vSphere vMotion, the virtual machine might lose network connectivity. As a side effect of service profile optimization, the NetX filter might get blocked after the migration. As a result, the virtual machine loses network connectivity.
After a host fails, the Entry Persistence Daemon (EPD) might not restart. Some components continue to persist after an object is deleted. Messages similar to the following appear in the EPD log: 2018-07-10T10:35:21.029Z 71308 -- XXX: Lock file '/scratch/epd-store.db' exists. 2018-07-10T10:35:21.029Z 71308 -- XXX: Did the host or EPD recently crash? 2018-07-10T10:35:21.029Z 71308 -- XXX: Assuming it's OK. Unlinking lock file.. 2018-07-10T10:35:21.030Z 71308 Failed to delete lock file: Is a directory
Virtual machines might go into invalid state and you cannot complete tasks such as power on, create, delete, migrate and reconfigure, depending on which locks are stuck in transactions as a result of an abrupt reboot of the ESXi host.
When you use devices with a physical block size other than 512 or 4096 Bytes, in the /var/log/vmkernel.log file of the ESXi host you might see multiple warning messages similar to: ScsiPath: 4395: The Physical block size "8192" reported by the path vmhba3:C0:T1:L0 is not supported.
Inefficient block allocation mechanisms might lead to multiple iterations of metadata reads. This causes a long quiesce time while creating and extending thick provisioned lazy zeroed VMDK files on a VMFS6 datastore.